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Cox I, Xu ZY, Grzywacz R, Ong WJ, Rasco BC, Kitamura N, Hoskins D, Neupane S, Ruland TJ, Allmond JM, King TT, Lubna RS, Rykaczewski KP, Schatz H, Sherrill BM, Tarasov OB, Ayangeakaa AD, Berg HC, Bleuel DL, Cerizza G, Christie J, Chester A, Davis J, Dembski C, Doetsch AA, Duarte JG, Estrade A, Fijałkowska A, Gray TJ, Good EC, Haak K, Hanai S, Harke JT, Harris C, Hermansen K, Hoff DEM, Jain R, Karny M, Kolos K, Laminack A, Liddick SN, Longfellow B, Lyons S, Madurga M, Mogannam MJ, Nowicki A, Ogunbeku TH, Owens-Fryar G, Rajabali MM, Richard AL, Ronning EK, Rose GE, Siegl K, Singh M, Spyrou A, Sweet A, Tsantiri A, Walters WB, Yokoyama R. Proton Shell Gaps in N=28 Nuclei from the First Complete Spectroscopy Study with FRIB Decay Station Initiator. Phys Rev Lett 2024; 132:152503. [PMID: 38682970 DOI: 10.1103/physrevlett.132.152503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 12/12/2023] [Accepted: 03/08/2024] [Indexed: 05/01/2024]
Abstract
The first complete measurement of the β-decay strength distribution of _{17}^{45}Cl_{28} was performed at the Facility for Rare Isotope Beams (FRIB) with the FRIB Decay Station Initiator during the second FRIB experiment. The measurement involved the detection of neutrons and γ rays in two focal planes of the FRIB Decay Station Initiator in a single experiment for the first time. This enabled an analytical consistency in extracting the β-decay strength distribution over the large range of excitation energies, including neutron unbound states. We observe a rapid increase in the β-decay strength distribution above the neutron separation energy in _{18}^{45}Ar_{27}. This was interpreted to be caused by the transitioning of neutrons into protons excited across the Z=20 shell gap. The SDPF-MU interaction with reduced shell gap best reproduced the data. The measurement demonstrates a new approach that is sensitive to the proton shell gap in neutron rich nuclei according to SDPF-MU calculations.
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Affiliation(s)
- I Cox
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - Z Y Xu
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - R Grzywacz
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - W-J Ong
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B C Rasco
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - N Kitamura
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - D Hoskins
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - S Neupane
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - T J Ruland
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - J M Allmond
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - T T King
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - R S Lubna
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - K P Rykaczewski
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - H Schatz
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - B M Sherrill
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - O B Tarasov
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - A D Ayangeakaa
- Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
- Triangle Universities Nuclear Laboratory, Duke University, Durham, North Carolina 27708, USA
| | - H C Berg
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - D L Bleuel
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G Cerizza
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - J Christie
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - A Chester
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - J Davis
- Pacific Northwest National Laboratory, Richland, Washington 99354, USA
| | - C Dembski
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - A A Doetsch
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - J G Duarte
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Estrade
- Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA
| | - A Fijałkowska
- Faculty of Physics, University of Warsaw, PL 02-093 Warsaw, Poland
| | - T J Gray
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - E C Good
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - K Haak
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - S Hanai
- Center for Nuclear Study, University of Tokyo, Wako, Saitama 351-0198, Japan
| | - J T Harke
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C Harris
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - K Hermansen
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - D E M Hoff
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Jain
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Karny
- Faculty of Physics, University of Warsaw, PL 02-093 Warsaw, Poland
| | - K Kolos
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Laminack
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - S N Liddick
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - B Longfellow
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S Lyons
- Pacific Northwest National Laboratory, Richland, Washington 99354, USA
| | - M Madurga
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - M J Mogannam
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - A Nowicki
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - T H Ogunbeku
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G Owens-Fryar
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - M M Rajabali
- Physics Department, Tennessee Technological University, Cookeville, Tennessee 38505, USA
| | - A L Richard
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - E K Ronning
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - G E Rose
- University of California, Berkeley, Berkeley, California 94704, USA
| | - K Siegl
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - M Singh
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - A Spyrou
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - A Sweet
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Tsantiri
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - W B Walters
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
| | - R Yokoyama
- Center for Nuclear Study, University of Tokyo, Wako, Saitama 351-0198, Japan
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Xu ZY, Madurga M, Grzywacz R, King TT, Algora A, Andreyev AN, Benito J, Berry T, Borge MJG, Costache C, De Witte H, Fijalkowska A, Fraile LM, Fynbo HOU, Gottardo A, Halverson C, Harkness-Brennan LJ, Heideman J, Huyse M, Illana A, Janiak Ł, Judson DS, Korgul A, Kurtukian-Nieto T, Lazarus I, Lică R, Lozeva R, Marginean N, Marginean R, Mazzocchi C, Mihai C, Mihai RE, Morales AI, Page RD, Pakarinen J, Piersa-Siłkowska M, Podolyák Z, Sarriguren P, Singh M, Sotty C, Stepaniuk M, Tengblad O, Turturica A, Van Duppen P, Vedia V, Viñals S, Warr N, Yokoyama R, Yuan CX. ^{133}In: A Rosetta Stone for Decays of r-Process Nuclei. Phys Rev Lett 2023; 131:022501. [PMID: 37505957 DOI: 10.1103/physrevlett.131.022501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 04/25/2023] [Accepted: 06/14/2023] [Indexed: 07/30/2023]
Abstract
The β decays from both the ground state and a long-lived isomer of ^{133}In were studied at the ISOLDE Decay Station (IDS). With a hybrid detection system sensitive to β, γ, and neutron spectroscopy, the comparative partial half-lives (logft) have been measured for all their dominant β-decay channels for the first time, including a low-energy Gamow-Teller transition and several first-forbidden (FF) transitions. Uniquely for such a heavy neutron-rich nucleus, their β decays selectively populate only a few isolated neutron unbound states in ^{133}Sn. Precise energy and branching-ratio measurements of those resonances allow us to benchmark β-decay theories at an unprecedented level in this region of the nuclear chart. The results show good agreement with the newly developed large-scale shell model (LSSM) calculations. The experimental findings establish an archetype for the β decay of neutron-rich nuclei southeast of ^{132}Sn and will serve as a guide for future theoretical development aiming to describe accurately the key β decays in the rapid-neutron capture (r-) process.
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Affiliation(s)
- Z Y Xu
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - M Madurga
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - R Grzywacz
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - T T King
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - A Algora
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
- Institute of Nuclear Research (ATOMKI), P. O. Box 51, H-4001 Debrecen, Hungary
| | - A N Andreyev
- School of Physics, Engineering and Technology, University of York, North Yorkshire YO10 5DD, United Kingdom
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - J Benito
- Grupo de Física Nuclear and IPARCOS, Facultad de CC. Físicas, Universidad Complutense de Madrid, E-28040 Madrid, Spain
- Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131, Padova, Italy
- Dipartimento di Fisica e Astronomia, Università di Padova, I-35131 Padova, Italy
| | - T Berry
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - M J G Borge
- Instituto de Estructura de la Materia, IEM-CSIC, Serrano 113 bis, E-28006 Madrid, Spain
| | - C Costache
- Horia Hulubei National Institute for Physics and Nuclear Engineering, RO-077125 Bucharest, Romania
| | - H De Witte
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
| | - A Fijalkowska
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA
- Faculty of Physics, University of Warsaw, PL 02-093 Warsaw, Poland
| | - L M Fraile
- Grupo de Física Nuclear and IPARCOS, Facultad de CC. Físicas, Universidad Complutense de Madrid, E-28040 Madrid, Spain
| | - H O U Fynbo
- Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
| | - A Gottardo
- IPN, IN2P3-CNRS, Université Paris-Sud, Université Paris Saclay, 91406 Orsay Cedex, France
| | - C Halverson
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - L J Harkness-Brennan
- Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - J Heideman
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - M Huyse
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
| | - A Illana
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - Ł Janiak
- Faculty of Physics, University of Warsaw, PL 02-093 Warsaw, Poland
- National Centre for Nuclear Research, 05-400 Otwock, świerk, Poland
| | - D S Judson
- Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - A Korgul
- Faculty of Physics, University of Warsaw, PL 02-093 Warsaw, Poland
| | - T Kurtukian-Nieto
- CENBG, Université de Bordeaux-UMR 5797 CNRS/IN2P3, Chemin du Solarium, 33175 Gradignan, France
| | - I Lazarus
- STFC Daresbury, Daresbury, Warrington WA4 4AD, United Kingdom
| | - R Lică
- Horia Hulubei National Institute for Physics and Nuclear Engineering, RO-077125 Bucharest, Romania
- ISOLDE, EP Department, CERN, CH-1211 Geneva, Switzerland
| | - R Lozeva
- Université Paris-Saclay, IJCLab, CNRS/IN2P3, F-91405 Orsay, France
| | - N Marginean
- Horia Hulubei National Institute for Physics and Nuclear Engineering, RO-077125 Bucharest, Romania
| | - R Marginean
- Horia Hulubei National Institute for Physics and Nuclear Engineering, RO-077125 Bucharest, Romania
| | - C Mazzocchi
- Faculty of Physics, University of Warsaw, PL 02-093 Warsaw, Poland
| | - C Mihai
- Horia Hulubei National Institute for Physics and Nuclear Engineering, RO-077125 Bucharest, Romania
| | - R E Mihai
- Horia Hulubei National Institute for Physics and Nuclear Engineering, RO-077125 Bucharest, Romania
| | - A I Morales
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
| | - R D Page
- Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - J Pakarinen
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014 Jyväskylä, Finland
- Helsinki Institute of Physics, University of Helsinki, P.O. Box 64, FIN-00014 Helsinki, Finland
| | - M Piersa-Siłkowska
- Faculty of Physics, University of Warsaw, PL 02-093 Warsaw, Poland
- ISOLDE, EP Department, CERN, CH-1211 Geneva, Switzerland
| | - Zs Podolyák
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - P Sarriguren
- Instituto de Estructura de la Materia, IEM-CSIC, Serrano 113 bis, E-28006 Madrid, Spain
| | - M Singh
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - Ch Sotty
- Horia Hulubei National Institute for Physics and Nuclear Engineering, RO-077125 Bucharest, Romania
| | - M Stepaniuk
- Faculty of Physics, University of Warsaw, PL 02-093 Warsaw, Poland
| | - O Tengblad
- Instituto de Estructura de la Materia, IEM-CSIC, Serrano 113 bis, E-28006 Madrid, Spain
| | - A Turturica
- Horia Hulubei National Institute for Physics and Nuclear Engineering, RO-077125 Bucharest, Romania
| | - P Van Duppen
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
| | - V Vedia
- Grupo de Física Nuclear and IPARCOS, Facultad de CC. Físicas, Universidad Complutense de Madrid, E-28040 Madrid, Spain
| | - S Viñals
- Instituto de Estructura de la Materia, IEM-CSIC, Serrano 113 bis, E-28006 Madrid, Spain
| | - N Warr
- Institut für Kernphysik, Universität zu Köln, 50937 Köln, Germany
| | - R Yokoyama
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - C X Yuan
- Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University, Zhuhai, 519082, Guangdong, China
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Hayashi R, Katsumi T, Ansai O, Takei S, Yokoyama R, Yuki A, Hasegawa A, Takatsuka S, Takenouchi T, Abe R. 157 Analysis of the hybrid schwannoma and neurofibroma including a case report of schwannomatosis caused by a mutation in the LZTR1 gene. J Invest Dermatol 2022. [DOI: 10.1016/j.jid.2022.09.167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Phong VH, Nishimura S, Lorusso G, Davinson T, Estrade A, Hall O, Kawano T, Liu J, Montes F, Nishimura N, Grzywacz R, Rykaczewski KP, Agramunt J, Ahn DS, Algora A, Allmond JM, Baba H, Bae S, Brewer NT, Bruno CG, Caballero-Folch R, Calviño F, Coleman-Smith PJ, Cortes G, Dillmann I, Domingo-Pardo C, Fijalkowska A, Fukuda N, Go S, Griffin CJ, Ha J, Harkness-Brennan LJ, Isobe T, Kahl D, Khiem LH, Kiss GG, Korgul A, Kubono S, Labiche M, Lazarus I, Liang J, Liu Z, Matsui K, Miernik K, Moon B, Morales AI, Morrall P, Nepal N, Page RD, Piersa-Siłkowska M, Pucknell VFE, Rasco BC, Rubio B, Sakurai H, Shimizu Y, Stracener DW, Sumikama T, Suzuki H, Tain JL, Takeda H, Tarifeño-Saldivia A, Tolosa-Delgado A, Wolińska-Cichocka M, Woods PJ, Yokoyama R. β-Delayed One and Two Neutron Emission Probabilities Southeast of ^{132}Sn and the Odd-Even Systematics in r-Process Nuclide Abundances. Phys Rev Lett 2022; 129:172701. [PMID: 36332266 DOI: 10.1103/physrevlett.129.172701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2022] [Revised: 07/30/2022] [Accepted: 08/25/2022] [Indexed: 06/16/2023]
Abstract
The β-delayed one- and two-neutron emission probabilities (P_{1n} and P_{2n}) of 20 neutron-rich nuclei with N≥82 have been measured at the RIBF facility of the RIKEN Nishina Center. P_{1n} of ^{130,131}Ag, ^{133,134}Cd, ^{135,136}In, and ^{138,139}Sn were determined for the first time, and stringent upper limits were placed on P_{2n} for nearly all cases. β-delayed two-neutron emission (β2n) was unambiguously identified in ^{133}Cd and ^{135,136}In, and their P_{2n} were measured. Weak β2n was also detected from ^{137,138}Sn. Our results highlight the effect of the N=82 and Z=50 shell closures on β-delayed neutron emission probability and provide stringent benchmarks for newly developed macroscopic-microscopic and self-consistent global models with the inclusion of a statistical treatment of neutron and γ emission. The impact of our measurements on r-process nucleosynthesis was studied in a neutron star merger scenario. Our P_{1n} and P_{2n} have a direct impact on the odd-even staggering of the final abundance, improving the agreement between calculated and observed Solar System abundances. The odd isotope fraction of Ba in r-process-enhanced (r-II) stars is also better reproduced using our new data.
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Affiliation(s)
- V H Phong
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- University of Science, Vietnam National University, Hanoi 120062, Vietnam
| | - S Nishimura
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - G Lorusso
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- National Physical Laboratory, Teddington TW11 0LW, United Kingdom
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - T Davinson
- School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
| | - A Estrade
- Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA
| | - O Hall
- School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
| | - T Kawano
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - J Liu
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- Department of Physics, University of Hong Kong, Pokfulman Road, Hong Kong
| | - F Montes
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - N Nishimura
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- Astrophysical Big-Bang Laboratory, Cluster for Pioneering Research, RIKEN, Wako, Saitama 351-0198, Japan
| | - R Grzywacz
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - K P Rykaczewski
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - J Agramunt
- Instituto de Fsica Corpuscular, CSIC and Universitat de Valencia, E-46980 Paterna, Spain
| | - D S Ahn
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- Center for Exotic Nuclear Studies, Institute for Basic Science, Daejeon 34126, Republic of Korea
| | - A Algora
- Instituto de Fsica Corpuscular, CSIC and Universitat de Valencia, E-46980 Paterna, Spain
| | - J M Allmond
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - H Baba
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - S Bae
- Center for Exotic Nuclear Studies, Institute for Basic Science, Daejeon 34126, Republic of Korea
| | - N T Brewer
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - C G Bruno
- School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
| | | | - F Calviño
- Universitat Politecnica de Catalunya, E-08028 Barcelona, Spain
| | - P J Coleman-Smith
- STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom
| | - G Cortes
- Universitat Politecnica de Catalunya, E-08028 Barcelona, Spain
| | - I Dillmann
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia V8P 5C2, Canada
| | - C Domingo-Pardo
- Instituto de Fsica Corpuscular, CSIC and Universitat de Valencia, E-46980 Paterna, Spain
| | - A Fijalkowska
- Faculty of Physics, University of Warsaw, PL02-093 Warsaw, Poland
| | - N Fukuda
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - S Go
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - C J Griffin
- School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
| | - J Ha
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- Seoul National University, Department of Physics and Astronomy, Seoul 08826, Republic of Korea
| | - L J Harkness-Brennan
- Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - T Isobe
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - D Kahl
- School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
- Extreme Light Infrastructure-Nuclear Physics, Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), 077125 Bucharest-Măgurele, Romania
| | - L H Khiem
- Institute of Physics, Vietnam Academy of Science and Technology, Ba Dinh, 118011 Hanoi, Vietnam
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Cau Giay, 122102 Hanoi, Vietnam
| | - G G Kiss
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- Institute for Nuclear Research (Atomki), Debrecen H4032, Hungary
| | - A Korgul
- Faculty of Physics, University of Warsaw, PL02-093 Warsaw, Poland
| | - S Kubono
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - M Labiche
- STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom
| | - I Lazarus
- STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom
| | - J Liang
- McMaster University, Department of Physics and Astronomy, Hamilton, Ontario L8S 4M1, Canada
| | - Z Liu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - K Matsui
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- University of Tokyo, Department of Physics, Tokyo 113-0033, Japan
| | - K Miernik
- Faculty of Physics, University of Warsaw, PL02-093 Warsaw, Poland
| | - B Moon
- Center for Exotic Nuclear Studies, Institute for Basic Science, Daejeon 34126, Republic of Korea
| | - A I Morales
- Instituto de Fsica Corpuscular, CSIC and Universitat de Valencia, E-46980 Paterna, Spain
| | - P Morrall
- STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom
| | - N Nepal
- Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA
| | - R D Page
- Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | | | - V F E Pucknell
- STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom
| | - B C Rasco
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - B Rubio
- Instituto de Fsica Corpuscular, CSIC and Universitat de Valencia, E-46980 Paterna, Spain
| | - H Sakurai
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- University of Tokyo, Department of Physics, Tokyo 113-0033, Japan
| | - Y Shimizu
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - D W Stracener
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - T Sumikama
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - H Suzuki
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - J L Tain
- Instituto de Fsica Corpuscular, CSIC and Universitat de Valencia, E-46980 Paterna, Spain
| | - H Takeda
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - A Tarifeño-Saldivia
- Instituto de Fsica Corpuscular, CSIC and Universitat de Valencia, E-46980 Paterna, Spain
- Universitat Politecnica de Catalunya, E-08028 Barcelona, Spain
| | - A Tolosa-Delgado
- Instituto de Fsica Corpuscular, CSIC and Universitat de Valencia, E-46980 Paterna, Spain
| | - M Wolińska-Cichocka
- Heavy Ion Laboratory, University of Warsaw, Pasteura 5A, PL-02-093 Warsaw, Poland
| | - P J Woods
- School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
| | - R Yokoyama
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Center for Nuclear Study, University of Tokyo, RIKEN Campus, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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5
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Yokoyama R, Hayashi R, Ansai O, Hasegawa A, Shinkuma S, Abe R. 159 Congenital leukonychia caused by a mutation in the GJB2 gene. J Invest Dermatol 2021. [DOI: 10.1016/j.jid.2021.02.179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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6
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Michimasa S, Kobayashi M, Kiyokawa Y, Ota S, Yokoyama R, Nishimura D, Ahn DS, Baba H, Berg GPA, Dozono M, Fukuda N, Furuno T, Ideguchi E, Inabe N, Kawabata T, Kawase S, Kisamori K, Kobayashi K, Kubo T, Kubota Y, Lee CS, Matsushita M, Miya H, Mizukami A, Nagakura H, Oikawa H, Sakai H, Shimizu Y, Stolz A, Suzuki H, Takaki M, Takeda H, Takeuchi S, Tokieda H, Uesaka T, Yako K, Yamaguchi Y, Yanagisawa Y, Yoshida K, Shimoura S. Mapping of a New Deformation Region around ^{62}Ti. Phys Rev Lett 2020; 125:122501. [PMID: 33016755 DOI: 10.1103/physrevlett.125.122501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 06/12/2020] [Accepted: 07/21/2020] [Indexed: 06/11/2023]
Abstract
We performed the first direct mass measurements of neutron-rich scandium, titanium, and vanadium isotopes around the neutron number 40 at the RIKEN RI Beam Factory using the time-of-flight magnetic-rigidity technique. The atomic mass excesses of ^{58-60}Sc, ^{60-62}Ti, and ^{62-64}V were measured for the first time. The experimental results show that the two-neutron separation energies in the vicinity of ^{62}Ti increase compared to neighboring nuclei. This shows that the masses of Ti isotopes near N=40 are affected by the Jahn-Teller effect. Therefore, a development of Jahn-Teller stabilization appears below the Cr isotopes, and the systematics in Sc, Ti, and V isotopes suggest that ^{62}Ti is located close to the peak of the Jahn-Teller effect.
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Affiliation(s)
- S Michimasa
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Kobayashi
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Kiyokawa
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Ota
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - R Yokoyama
- Department of Physics and Astronomy, the University of Tennessee, Knoxville, Tennessee 37996, USA
| | - D Nishimura
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Natural Sciences, Tokyo City University, Tamazutsumi 1-28-1, Setagaya-ku, Tokyo 158-8557, Japan
| | - D S Ahn
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Baba
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - G P A Berg
- Department of Physics and Joint Institute for Nuclear Astrophysics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - M Dozono
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - N Fukuda
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Furuno
- Department of Physics, Kyoto University, Kitashirakawa-Oiwake, Sakyo, Kyoto 606-8502, Japan
| | - E Ideguchi
- Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - N Inabe
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Kawabata
- Department of Physics, Kyoto University, Kitashirakawa-Oiwake, Sakyo, Kyoto 606-8502, Japan
| | - S Kawase
- Department of Advanced Energy Engineering Science, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan
| | - K Kisamori
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Kobayashi
- Department of Physics, Rikkyo University, Toshima, Tokyo 171-8501, Japan
| | - T Kubo
- Facility for Rare Isotope Beams, Michigan State University, 640 S Shaw Lane, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, Michigan State University, 640 S Shaw Lane, East Lansing, Michigan 48824, USA
| | - Y Kubota
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - C S Lee
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Matsushita
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Miya
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - A Mizukami
- Department of Physics, Tokyo University of Science, Noda, Chiba 278-8510, Japan
| | - H Nagakura
- Department of Physics, Rikkyo University, Toshima, Tokyo 171-8501, Japan
| | - H Oikawa
- Department of Physics, Tokyo University of Science, Noda, Chiba 278-8510, Japan
| | - H Sakai
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Shimizu
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - A Stolz
- National Superconducting Cyclotron Laboratory, Michigan State University, 640 S Shaw Lane, East Lansing, Michigan 48824, USA
| | - H Suzuki
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Takaki
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Takeda
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Takeuchi
- Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
| | - H Tokieda
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Uesaka
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Yako
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Yamaguchi
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Yanagisawa
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Yoshida
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Shimoura
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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7
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Tang TL, Uesaka T, Kawase S, Beaumel D, Dozono M, Fujii T, Fukuda N, Fukunaga T, Galindo-Uribarri A, Hwang SH, Inabe N, Kameda D, Kawahara T, Kim W, Kisamori K, Kobayashi M, Kubo T, Kubota Y, Kusaka K, Lee CS, Maeda Y, Matsubara H, Michimasa S, Miya H, Noro T, Obertelli A, Ogata K, Ota S, Padilla-Rodal E, Sakaguchi S, Sakai H, Sasano M, Shimoura S, Stepanyan SS, Suzuki H, Takaki M, Takeda H, Tokieda H, Wakasa T, Wakui T, Yako K, Yanagisawa Y, Yasuda J, Yokoyama R, Yoshida K, Yoshida K, Zenihiro J. How Different is the Core of ^{25}F from ^{24}O_{g.s.} ? Phys Rev Lett 2020; 124:212502. [PMID: 32530645 DOI: 10.1103/physrevlett.124.212502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Revised: 12/15/2019] [Accepted: 04/13/2020] [Indexed: 06/11/2023]
Abstract
The structure of a neutron-rich ^{25}F nucleus is investigated by a quasifree (p,2p) knockout reaction at 270A MeV in inverse kinematics. The sum of spectroscopic factors of π0d_{5/2} orbital is found to be 1.0±0.3. However, the spectroscopic factor with residual ^{24}O nucleus being in the ground state is found to be only 0.36±0.13, while those in the excited state is 0.65±0.25. The result shows that the ^{24}O core of ^{25}F nucleus significantly differs from a free ^{24}O nucleus, and the core consists of ∼35% ^{24}O_{g.s.}. and ∼65% excited ^{24}O. The result may infer that the addition of the 0d_{5/2} proton considerably changes neutron structure in ^{25}F from that in ^{24}O, which could be a possible mechanism responsible for the oxygen dripline anomaly.
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Affiliation(s)
- T L Tang
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Uesaka
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Kawase
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - D Beaumel
- Institut de physique nucléaire d'Orsay, 91406 Orsay, France
| | - M Dozono
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Fujii
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - N Fukuda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Fukunaga
- Kyushu University, 6-10-1 Hakozaki, Higashi, Fukuoka 812-8581, Japan
| | - A Galindo-Uribarri
- Oak Ridge National Laboratory, 1 Bethel Valley Rd, Oak Ridge, Tennessee 37831, USA
| | - S H Hwang
- Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea
| | - N Inabe
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - D Kameda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Kawahara
- Toho University, 2-2-1 Miyama, Funabashi-shi, Chiba 274-8510, Japan
| | - W Kim
- Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea
| | - K Kisamori
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - M Kobayashi
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - T Kubo
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Kubota
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - K Kusaka
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - C S Lee
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - Y Maeda
- University of Miyazaki, 1-1 Gakuen Kibanadai-nishi, Miyazaki 889-2192, Japan
| | - H Matsubara
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Michimasa
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - H Miya
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - T Noro
- Kyushu University, 6-10-1 Hakozaki, Higashi, Fukuoka 812-8581, Japan
| | - A Obertelli
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- IRFU, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
| | - K Ogata
- RCNP, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
- Department of Physics, Osaka City University, Osaka 558-8585, Japan
| | - S Ota
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - E Padilla-Rodal
- Universidad Nacional Autónoma de México, Instituto de Ciencias Nucleares, AP 70-543, México City 04510, DF, México
| | - S Sakaguchi
- Kyushu University, 6-10-1 Hakozaki, Higashi, Fukuoka 812-8581, Japan
| | - H Sakai
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Sasano
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Shimoura
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - S S Stepanyan
- Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea
| | - H Suzuki
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Takaki
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - H Takeda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Tokieda
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - T Wakasa
- Kyushu University, 6-10-1 Hakozaki, Higashi, Fukuoka 812-8581, Japan
| | - T Wakui
- CYRIC, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - K Yako
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - Y Yanagisawa
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - J Yasuda
- Kyushu University, 6-10-1 Hakozaki, Higashi, Fukuoka 812-8581, Japan
| | - R Yokoyama
- Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - K Yoshida
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Yoshida
- RCNP, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - J Zenihiro
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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8
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Tomii K, Fujimoto A, Yokoyama R, Kabata Y, Fujita S, Hayashi R, Abe R. Erythema dyschromicum perstans with a Wagyu beef‐like appearance on dermoscopy. J Eur Acad Dermatol Venereol 2019; 34:e141-e142. [DOI: 10.1111/jdv.16096] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- K. Tomii
- Division of Dermatology Niigata University Graduate School of Medical and Dental Sciences Niigata Japan
| | - A. Fujimoto
- Division of Dermatology Niigata University Graduate School of Medical and Dental Sciences Niigata Japan
| | - R. Yokoyama
- Division of Dermatology Niigata University Graduate School of Medical and Dental Sciences Niigata Japan
| | - Y. Kabata
- Division of Dermatology Niigata University Graduate School of Medical and Dental Sciences Niigata Japan
| | - S. Fujita
- Fujita Dermatological Clinic Nagaoka Japan
| | - R. Hayashi
- Division of Dermatology Niigata University Graduate School of Medical and Dental Sciences Niigata Japan
| | - R. Abe
- Division of Dermatology Niigata University Graduate School of Medical and Dental Sciences Niigata Japan
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9
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Michimasa S, Kobayashi M, Kiyokawa Y, Ota S, Ahn DS, Baba H, Berg GPA, Dozono M, Fukuda N, Furuno T, Ideguchi E, Inabe N, Kawabata T, Kawase S, Kisamori K, Kobayashi K, Kubo T, Kubota Y, Lee CS, Matsushita M, Miya H, Mizukami A, Nagakura H, Nishimura D, Oikawa H, Sakai H, Shimizu Y, Stolz A, Suzuki H, Takaki M, Takeda H, Takeuchi S, Tokieda H, Uesaka T, Yako K, Yamaguchi Y, Yanagisawa Y, Yokoyama R, Yoshida K, Shimoura S. Magic Nature of Neutrons in ^{54}Ca: First Mass Measurements of ^{55-57}Ca. Phys Rev Lett 2018; 121:022506. [PMID: 30085708 DOI: 10.1103/physrevlett.121.022506] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2018] [Revised: 04/21/2018] [Indexed: 06/08/2023]
Abstract
We perform the first direct mass measurements of neutron-rich calcium isotopes beyond neutron number 34 at the RIKEN Radioactive Isotope Beam Factory by using the time-of-flight magnetic-rigidity technique. The atomic mass excesses of ^{55-57}Ca are determined for the first time to be -18650(160), -13510(250), and -7370(990) keV, respectively. We examine the emergence of neutron magicity at N=34 based on the new atomic masses. The new masses provide experimental evidence for the appearance of a sizable energy gap between the neutron 2p_{1/2} and 1f_{5/2} orbitals in ^{54}Ca, comparable to the gap between the neutron 2p_{3/2} and 2p_{1/2} orbitals in ^{52}Ca. For the ^{56}Ca nucleus, an open-shell property in neutrons is suggested.
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Affiliation(s)
- S Michimasa
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Kobayashi
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Kiyokawa
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Ota
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - D S Ahn
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Baba
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - G P A Berg
- Department of Physics and Joint Institute for Nuclear Astrophysics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - M Dozono
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - N Fukuda
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Furuno
- Department of Physics, Kyoto University, Kitashirakawa-Oiwake, Sakyo, Kyoto 606-8502, Japan
| | - E Ideguchi
- Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - N Inabe
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Kawabata
- Department of Physics, Kyoto University, Kitashirakawa-Oiwake, Sakyo, Kyoto 606-8502, Japan
| | - S Kawase
- Department of Advanced Energy Engineering Sciences, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan
| | - K Kisamori
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Kobayashi
- Department of Physics, Rikkyo University, Toshima, Tokyo 171-8501, Japan
| | - T Kubo
- Facility for Rare Isotope Beams, Michigan State University, 640 South Shaw Lane, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, Michigan State University, 640 South Shaw Lane, East Lansing, Michigan 48824, USA
| | - Y Kubota
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - C S Lee
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Matsushita
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Miya
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - A Mizukami
- Department of Physics, Tokyo University of Science, Noda, Chiba 278-8510, Japan
| | - H Nagakura
- Department of Physics, Rikkyo University, Toshima, Tokyo 171-8501, Japan
| | - D Nishimura
- Department of Physics, Tokyo City University, Tamazutsumi 1-28-1, Setagaya-ku, Tokyo 158-8557, Japan
| | - H Oikawa
- Department of Physics, Tokyo University of Science, Noda, Chiba 278-8510, Japan
| | - H Sakai
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Shimizu
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - A Stolz
- National Superconducting Cyclotron Laboratory, Michigan State University, 640 South Shaw Lane, East Lansing, Michigan 48824, USA
| | - H Suzuki
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Takaki
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Takeda
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Takeuchi
- Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
| | - H Tokieda
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Uesaka
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Yako
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Yamaguchi
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Yanagisawa
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - R Yokoyama
- Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA
| | - K Yoshida
- RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Shimoura
- Center for Nuclear Study, The University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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Shinkuma S, Yokoyama R, Hayashi R, Nguyen H, Kawai T, Tomiyama K, Abe R. 810 A novel KITLG mutation detected only in the lesion of linear and whorled nevoid hypermelanosis. J Invest Dermatol 2018. [DOI: 10.1016/j.jid.2018.03.820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Wu J, Nishimura S, Lorusso G, Möller P, Ideguchi E, Regan PH, Simpson GS, Söderström PA, Walker PM, Watanabe H, Xu ZY, Baba H, Browne F, Daido R, Doornenbal P, Fang YF, Gey G, Isobe T, Lee PS, Liu JJ, Li Z, Korkulu Z, Patel Z, Phong V, Rice S, Sakurai H, Sinclair L, Sumikama T, Tanaka M, Yagi A, Ye YL, Yokoyama R, Zhang GX, Alharbi T, Aoi N, Bello Garrote FL, Benzoni G, Bruce AM, Carroll RJ, Chae KY, Dombradi Z, Estrade A, Gottardo A, Griffin CJ, Kanaoka H, Kojouharov I, Kondev FG, Kubono S, Kurz N, Kuti I, Lalkovski S, Lane GJ, Lee EJ, Lokotko T, Lotay G, Moon CB, Nishibata H, Nishizuka I, Nita CR, Odahara A, Podolyák Z, Roberts OJ, Schaffner H, Shand C, Taprogge J, Terashima S, Vajta Z, Yoshida S. 94 β-Decay Half-Lives of Neutron-Rich _{55}Cs to _{67}Ho: Experimental Feedback and Evaluation of the r-Process Rare-Earth Peak Formation. Phys Rev Lett 2017; 118:072701. [PMID: 28256889 DOI: 10.1103/physrevlett.118.072701] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Indexed: 06/06/2023]
Abstract
The β-decay half-lives of 94 neutron-rich nuclei ^{144-151}Cs, ^{146-154}Ba, ^{148-156}La, ^{150-158}Ce, ^{153-160}Pr, ^{156-162}Nd, ^{159-163}Pm, ^{160-166}Sm, ^{161-168}Eu, ^{165-170}Gd, ^{166-172}Tb, ^{169-173}Dy, ^{172-175}Ho, and two isomeric states ^{174m}Er, ^{172m}Dy were measured at the Radioactive Isotope Beam Factory, providing a new experimental basis to test theoretical models. Strikingly large drops of β-decay half-lives are observed at neutron-number N=97 for _{58}Ce, _{59}Pr, _{60}Nd, and _{62}Sm, and N=105 for _{63}Eu, _{64}Gd, _{65}Tb, and _{66}Dy. Features in the data mirror the interplay between pairing effects and microscopic structure. r-process network calculations performed for a range of mass models and astrophysical conditions show that the 57 half-lives measured for the first time play an important role in shaping the abundance pattern of rare-earth elements in the solar system.
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Affiliation(s)
- J Wu
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - S Nishimura
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - G Lorusso
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- National Physical Laboratory, NPL, Teddington, Middlesex TW11 0LW, United Kingdom
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - P Möller
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - E Ideguchi
- Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - P-H Regan
- National Physical Laboratory, NPL, Teddington, Middlesex TW11 0LW, United Kingdom
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - G S Simpson
- LPSC, Universite Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France
- School of Engineering, University of the West of Scotland, Paisley, PA1 2BE, United Kingdom
- Scottish Universities Physics Alliance, University of Glasgow, Glasgow, G12 8QQ, United Kingdom
| | - P-A Söderström
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - P M Walker
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - H Watanabe
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- IRCNPC, School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China
| | - Z Y Xu
- Department of Physics, the University of Hong Kong, Pokfulam Road, Hong Kong
- Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, 113-0033 Tokyo, Japan
| | - H Baba
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - F Browne
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- School of Computing Engineering and Mathematics, University of Brighton, Brighton, BN2 4GJ, United Kingdom
| | - R Daido
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
| | - P Doornenbal
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - Y F Fang
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
| | - G Gey
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- LPSC, Universite Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France
- Institut Laue-Langevin, B.P. 156, F-38042 Grenoble Cedex 9, France
| | - T Isobe
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - P S Lee
- Department of Physics, Chung-Ang University, Seoul 156-756, Republic of Korea
| | - J J Liu
- Department of Physics, the University of Hong Kong, Pokfulam Road, Hong Kong
| | - Z Li
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - Z Korkulu
- Institute for Nuclear Research, Hungarian Academy of Sciences, P. O. Box 51, Debrecen, H-4001, Hungary
| | - Z Patel
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - V Phong
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- Faculty of Physics, VNU Hanoi University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam
| | - S Rice
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - H Sakurai
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, 113-0033 Tokyo, Japan
| | - L Sinclair
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
- Department of Physics, University of York, Heslington, York, YO10 5DD, United Kingdom
| | - T Sumikama
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - M Tanaka
- Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - A Yagi
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
| | - Y L Ye
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - R Yokoyama
- Center for Nuclear Study (CNS), University of Tokyo, Wako-shi, Saitama 351-0198, Japan
| | - G X Zhang
- IRCNPC, School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China
| | - T Alharbi
- Department of Physics, College of Science in Zulfi, Almajmaah University, P.O. Box 1712, 11932, Saudi Arabia
| | - N Aoi
- Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Osaka 567-0047, Japan
| | | | - G Benzoni
- INFN, Sezione di Milano, via Celoria 16, I-20133 Milano, Italy
| | - A M Bruce
- School of Computing Engineering and Mathematics, University of Brighton, Brighton, BN2 4GJ, United Kingdom
| | - R J Carroll
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - K Y Chae
- Department of Physics, Sungkyunkwan University, Suwon 440-746, Republic of Korea
| | - Z Dombradi
- Institute for Nuclear Research, Hungarian Academy of Sciences, P. O. Box 51, Debrecen, H-4001, Hungary
| | - A Estrade
- School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
| | - A Gottardo
- Dipartimento di Fisica dellUniversit' degli Studi di Padova, I-35131 Padova, Italy
- INFN, Laboratori Nazionali di Legnaro, Legnaro I-35020, Italy
| | - C J Griffin
- School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
| | - H Kanaoka
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
| | - I Kojouharov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - F G Kondev
- Nuclear Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - S Kubono
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - N Kurz
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - I Kuti
- Institute for Nuclear Research, Hungarian Academy of Sciences, P. O. Box 51, Debrecen, H-4001, Hungary
| | - S Lalkovski
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - G J Lane
- Department of Nuclear Physics, R.S.P.E., Australian National University, Canberra, A.C.T. 0200, Australia
| | - E J Lee
- Department of Physics, Sungkyunkwan University, Suwon 440-746, Republic of Korea
| | - T Lokotko
- Department of Physics, the University of Hong Kong, Pokfulam Road, Hong Kong
| | - G Lotay
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - C-B Moon
- Hoseo University, Asan, Chungnam 336-795, Korea
| | - H Nishibata
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
| | - I Nishizuka
- Department of Physics, Tohoku University, Aoba, Sendai, Miyagi 980-8578, Japan
| | - C R Nita
- School of Computing Engineering and Mathematics, University of Brighton, Brighton, BN2 4GJ, United Kingdom
- Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH), RO-077125 Bucharest, Romania
| | - A Odahara
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
| | - Zs Podolyák
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - O J Roberts
- School of Physics, University College Dublin, Belfield, Dublin 4, Ireland
| | - H Schaffner
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - C Shand
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - J Taprogge
- Departamento de Fsica Teórica, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
- Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
| | - S Terashima
- IRCNPC, School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China
| | - Z Vajta
- Institute for Nuclear Research, Hungarian Academy of Sciences, P. O. Box 51, Debrecen, H-4001, Hungary
| | - S Yoshida
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
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Yamano T, Yokoyama R, Sugawara H, Imanaka Y. ISQUA16-1278THE DIFFERENCES OF STRENGTHS BETWEEN SUBGROUPS OF ACUTE CARE HOSPITALS IN ACCREDITATION SURVEY RESULT IN JAPAN:. Int J Qual Health Care 2016. [DOI: 10.1093/intqhc/mzw104.61] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Patel Z, Podolyák Z, Walker PM, Regan PH, Söderström PA, Watanabe H, Ideguchi E, Simpson GS, Nishimura S, Browne F, Doornenbal P, Lorusso G, Rice S, Sinclair L, Sumikama T, Wu J, Xu ZY, Aoi N, Baba H, Bello Garrote FL, Benzoni G, Daido R, Dombrádi Z, Fang Y, Fukuda N, Gey G, Go S, Gottardo A, Inabe N, Isobe T, Kameda D, Kobayashi K, Kobayashi M, Komatsubara T, Kojouharov I, Kubo T, Kurz N, Kuti I, Li Z, Liu HL, Matsushita M, Michimasa S, Moon CB, Nishizuka H, Nishizuka I, Odahara A, Şahin E, Sakurai H, Schaffner H, Suzuki H, Takeda H, Tanaka M, Taprogge J, Vajta Z, Xu FR, Yagi A, Yokoyama R. β-decay spectroscopy of neutron-rich160,161,162Sm isotopes. EPJ Web Conf 2016. [DOI: 10.1051/epjconf/201612302002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Wu J, Nishimura S, Lorusso G, Xu Z, Ideguchi E, Simpson G, Baba H, Browne F, Daido R, Doornebal P, Fang Y, Isobe T, Li Z, Patel Z, Rice S, Sinclair L, Söderström PA, Sumikama T, Watanabe H, Yagi A, Yokoyama R, Aoi N, Garrote FB, Benzoni G, Gey G, Gottardo A, Nishibata H, Odahara A, Sakurai H, Tanaka M, Taprogge J, Yamamoto T. β-decay half-lives of neutron-rich nuclei around158Nd, relevant to the formation of the A≈165 rare-earth element peak. EPJ Web of Conferences 2016. [DOI: 10.1051/epjconf/201610908003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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15
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Kisamori K, Shimoura S, Miya H, Michimasa S, Ota S, Assie M, Baba H, Baba T, Beaumel D, Dozono M, Fujii T, Fukuda N, Go S, Hammache F, Ideguchi E, Inabe N, Itoh M, Kameda D, Kawase S, Kawabata T, Kobayashi M, Kondo Y, Kubo T, Kubota Y, Kurata-Nishimura M, Lee CS, Maeda Y, Matsubara H, Miki K, Nishi T, Noji S, Sakaguchi S, Sakai H, Sasamoto Y, Sasano M, Sato H, Shimizu Y, Stolz A, Suzuki H, Takaki M, Takeda H, Takeuchi S, Tamii A, Tang L, Tokieda H, Tsumura M, Uesaka T, Yako K, Yanagisawa Y, Yokoyama R, Yoshida K. Candidate Resonant Tetraneutron State Populated by the ^{4}He(^{8}He,^{8}Be) Reaction. Phys Rev Lett 2016; 116:052501. [PMID: 26894705 DOI: 10.1103/physrevlett.116.052501] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Indexed: 06/05/2023]
Abstract
A candidate resonant tetraneutron state is found in the missing-mass spectrum obtained in the double-charge-exchange reaction ^{4}He(^{8}He,^{8}Be) at 186 MeV/u. The energy of the state is 0.83±0.65(stat)±1.25(syst) MeV above the threshold of four-neutron decay with a significance level of 4.9σ. Utilizing the large positive Q value of the (^{8}He,^{8}Be) reaction, an almost recoilless condition of the four-neutron system was achieved so as to obtain a weakly interacting four-neutron system efficiently.
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Affiliation(s)
- K Kisamori
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Shimoura
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - H Miya
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Michimasa
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - S Ota
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - M Assie
- IPN Orsay, 15 Rue, Georges, Clemenceau 91400 Orsay, France
| | - H Baba
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Baba
- Department of Physics, Kyoto University, Yoshida-Honcho, Sakyo, Kyoto 606-8501, Japan
| | - D Beaumel
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- IPN Orsay, 15 Rue, Georges, Clemenceau 91400 Orsay, France
| | - M Dozono
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Fujii
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - N Fukuda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Go
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - F Hammache
- IPN Orsay, 15 Rue, Georges, Clemenceau 91400 Orsay, France
| | - E Ideguchi
- Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - N Inabe
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Itoh
- Cyclotron and Radioisotope Center, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - D Kameda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Kawase
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - T Kawabata
- Department of Physics, Kyoto University, Yoshida-Honcho, Sakyo, Kyoto 606-8501, Japan
| | - M Kobayashi
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - Y Kondo
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8550, Japan
| | - T Kubo
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Kubota
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | | | - C S Lee
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Maeda
- Faculty of Engineering, University of Miyazaki, 1-1 Gakuen, Kibanadai-nishi, Miyazaki 889-2192, Japan
| | - H Matsubara
- National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba, Japan
| | - K Miki
- Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - T Nishi
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - S Noji
- National Superconducting Cyclotron Laboratory, Michigan State University, 640 S Shaw Lane, East Lansing, Michigan 48824, USA
| | - S Sakaguchi
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Kyushu University, 6-10-1 Hakozaki, Higashi, Fukuoka 812-8581, Japan
| | - H Sakai
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Sasamoto
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - M Sasano
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Sato
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Shimizu
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - A Stolz
- National Superconducting Cyclotron Laboratory, Michigan State University, 640 S Shaw Lane, East Lansing, Michigan 48824, USA
| | - H Suzuki
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Takaki
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - H Takeda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Takeuchi
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - A Tamii
- Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - L Tang
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - H Tokieda
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - M Tsumura
- Department of Physics, Kyoto University, Yoshida-Honcho, Sakyo, Kyoto 606-8501, Japan
| | - T Uesaka
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Yako
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - Y Yanagisawa
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - R Yokoyama
- Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
| | - K Yoshida
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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Patel Z, Söderström PA, Podolyák Z, Regan PH, Walker PM, Watanabe H, Ideguchi E, Simpson GS, Liu HL, Nishimura S, Wu Q, Xu FR, Browne F, Doornenbal P, Lorusso G, Rice S, Sinclair L, Sumikama T, Wu J, Xu ZY, Aoi N, Baba H, Bello Garrote FL, Benzoni G, Daido R, Fang Y, Fukuda N, Gey G, Go S, Gottardo A, Inabe N, Isobe T, Kameda D, Kobayashi K, Kobayashi M, Komatsubara T, Kojouharov I, Kubo T, Kurz N, Kuti I, Li Z, Matsushita M, Michimasa S, Moon CB, Nishibata H, Nishizuka I, Odahara A, Şahin E, Sakurai H, Schaffner H, Suzuki H, Takeda H, Tanaka M, Taprogge J, Vajta Z, Yagi A, Yokoyama R. Isomer decay spectroscopy of 164Sm and 166Gd: midshell collectivity around N=100. Phys Rev Lett 2014; 113:262502. [PMID: 25615314 DOI: 10.1103/physrevlett.113.262502] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Indexed: 06/04/2023]
Abstract
Excited states in the N=102 isotones 166Gd and 164Sm have been observed following isomeric decay for the first time at RIBF, RIKEN. The half-lives of the isomeric states have been measured to be 950(60) and 600(140) ns for 166Gd and 164Sm, respectively. Based on the decay patterns and potential energy surface calculations, including β6 deformation, a spin and parity of 6- has been assigned to the isomeric states in both nuclei. Collective observables are discussed in light of the systematics of the region, giving insight into nuclear shape evolution. The decrease in the ground-band energies of 166Gd and 164Sm (N=102) compared to 164Gd and 162Sm (N=100), respectively, presents evidence for the predicted deformed shell closure at N=100.
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Affiliation(s)
- Z Patel
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom and RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - P-A Söderström
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - Zs Podolyák
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - P H Regan
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom and National Physical Laboratory, Teddington, Middlesex TW11 0LW, United Kingdom
| | - P M Walker
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - H Watanabe
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan and International Research Center for Nuclei and Particles in the Cosmos, Beihang University, Beijing 100191, China and School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China
| | - E Ideguchi
- Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Osaka 567-0047, Japan and Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
| | - G S Simpson
- LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France
| | - H L Liu
- Department of Applied Physics, School of Science, Xi'an Jiaotong University, Xi'an 710049, China
| | - S Nishimura
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - Q Wu
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - F R Xu
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - F Browne
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan and School of Computing, Engineering and Mathematics, University of Brighton, Brighton, BN2 4JG, United Kingdom
| | - P Doornenbal
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - G Lorusso
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - S Rice
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom and RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - L Sinclair
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan and Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
| | - T Sumikama
- Department of Physics, Tohoku University, Aoba, Sendai, Miyagi 980-8578, Japan
| | - J Wu
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan and School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - Z Y Xu
- Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - N Aoi
- Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Osaka 567-0047, Japan and Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
| | - H Baba
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | | | - G Benzoni
- INFN Sezione di Milano, I-20133 Milano, Italy
| | - R Daido
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
| | - Y Fang
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
| | - N Fukuda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - G Gey
- LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France
| | - S Go
- Center for Nuclear Study (CNS), University of Tokyo, Wako, Saitama 351-0198, Japan
| | - A Gottardo
- Instituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro I-35020 Legnaro, Italy
| | - N Inabe
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - T Isobe
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - D Kameda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - K Kobayashi
- Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo 171-8501, Japan
| | - M Kobayashi
- Center for Nuclear Study (CNS), University of Tokyo, Wako, Saitama 351-0198, Japan
| | - T Komatsubara
- Research Facility Center for Pure and Applied Science, University of Tsukuba, Ibaraki 305-8577, Japan and Rare Isotope Science Project, Institute for Basic Science, Daejeon 305-811, Korea
| | - I Kojouharov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - T Kubo
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - N Kurz
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - I Kuti
- Institute for Nuclear Research, Hungarian Academy of Sciences, P. O. Box 51, Debrecen H-4001, Hungary
| | - Z Li
- School of Physics, Peking University, Beijing 100871, China
| | - M Matsushita
- Center for Nuclear Study (CNS), University of Tokyo, Wako, Saitama 351-0198, Japan
| | - S Michimasa
- Center for Nuclear Study (CNS), University of Tokyo, Wako, Saitama 351-0198, Japan
| | - C-B Moon
- Hoseo University, Asan, Chungnam 336-795, Korea
| | - H Nishibata
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
| | - I Nishizuka
- Department of Physics, Tohoku University, Aoba, Sendai, Miyagi 980-8578, Japan
| | - A Odahara
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
| | - E Şahin
- Department of Physics, University of Oslo, Oslo, Norway
| | - H Sakurai
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan and Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - H Schaffner
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - H Suzuki
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - H Takeda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - M Tanaka
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
| | - J Taprogge
- Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain and Departamento de Física Teórica, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - Zs Vajta
- Institute for Nuclear Research, Hungarian Academy of Sciences, P. O. Box 51, Debrecen H-4001, Hungary
| | - A Yagi
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
| | - R Yokoyama
- Center for Nuclear Study (CNS), University of Tokyo, Wako-shi, Saitama 351-0198, Japan
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Uchiyama Y, Ando H, Yokoyama R, Hara T, Fujita H, Iwama T. Computer-Aided Diagnosis Scheme for Detection of Unruptured Intracranial Aneurysms in MR Angiography. Conf Proc IEEE Eng Med Biol Soc 2012; 2005:3031-4. [PMID: 17282882 DOI: 10.1109/iembs.2005.1617113] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The detection of unruptured intracranial aneurysms is a major subject in magnetic resonance angiography (MRA) images. However,it is difficult for radiologists to detect small aneurysms on the maximum intensity projection (MIP) images, because adjacent vessels overlap with the aneurysm. The purpose of this study was to develop an automated computerized detection of aneurysms in order to assist radiologists' interpretation as a "second opinion." The vessels were first segmented from background by use of gray-level thresholding and region growing technique. The gradient concentrate (GC) filter was then applied to the segmented vessels for enhancement of aneurysm. The initial aneurysm candidate was identified in the GC image with a gray level threthold. For removal of false positives (FPs), we determined three features, i.e.,size,sphericity, and mean value of GC image in each of the candidate regions. Finally, the rule-based schemes with these features and quadratic discriminant analysis were applied for distinction between aneurysms and FPs. The sensitivity of our method for detection of aneurysms was 100% (7/7) with 1.85 FPs per patient. With our computerized scheme, all aneurysms were detected correctly with low FP rates, and would be useful in assisting radiologists for identifying correct aneurysms and for reducing the interpretation time.
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Affiliation(s)
- Y Uchiyama
- Department of Intelligent Image Information, Graduate School of Medicine, Gifu University, Japan
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18
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Kamiya N, Zhou X, Chen H, Muramatsu C, Hara T, Yokoyama R, Kanematsu M, Hoshi H, Fujita H. Automated segmentation of recuts abdominis muscle using shape model in X-ray CT images. Annu Int Conf IEEE Eng Med Biol Soc 2012; 2011:7993-6. [PMID: 22256195 DOI: 10.1109/iembs.2011.6091971] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Our purpose in this study is to segment the rectus abdominis muscle region in X-ray CT images, and we propose a novel recognition method based on the shape model. In this method, three steps are included in the segmentation process. The first is to generate a shape model for the rectus abdominis muscle. The second is to recognize anatomical feature points corresponding to the origin and insertion of the muscle, and the third is to segment the rectus abdominis muscles based on the shape model. We generated the shape model from 20 CT cases and tested the model to recognize the muscle in 20 other CT cases. The average values for the Jaccard similarity coefficient (JSC) and true segmentation coefficient (TSC) were 0.841 and 0.863, respectively. The results suggest the validity of the model-based segmentation for the rectus abdominis muscle.
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Affiliation(s)
- N Kamiya
- Department of Intelligent Image Information, Division of Regeneration and Advanced Medical Sciences, Graduate School of Medicine, Gifu University, Yanagido 1-1, Gifu 501-1194, Japan.
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19
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Yamazaki Y, Yokoyama R, Nagai T, Goto A. Formation of a fluvial non-parasitic population of Lethenteron camtschaticum as the first step in petromyzontid speciation. J Fish Biol 2011; 79:2043-2059. [PMID: 22141904 DOI: 10.1111/j.1095-8649.2011.03150.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
To elucidate the petromyzontid speciation process, the genetic independence of the fluvial non-parasitic populations within the anadromous parasitic Lethenteron camtschaticum was estimated by using polymorphic microsatellite loci. Abundant gene flow was revealed in multitemporal scales between potentially sympatric populations, suggesting ongoing gene flow resulting from imperfect size-assortative mating between them and plastic determination of life histories. On the contrary, landlocked fluvial non-parasitic populations in the upper region of dams were genetically divergent from anadromous parasitic populations. The temporal heterogeneity of gene flow, i.e. contemporary little gene flow but significant gene flow over the long-term between the landlocked fluvial non-parasitic and anadromous parasitic populations was elucidated. In addition, the divergence time of isolation of the landlocked populations from the ancestral anadromous parasitic population was estimated to have occurred 17.9-428.2 years ago, which includes the construction times of an initial dam c. 90 years ago. These instances indicate that the landlocked populations should have very recently been established, and subsequent accumulation of divergence and development of reproductive isolation are predicted. The present landlocked fluvial non-parasitic populations should be analogous to the founder populations in terms of petromyzontid speciation. The data also strongly support the hypothesis of multitemporal and multispatial speciation in the petromyzontid stem-satellite species complex.
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Affiliation(s)
- Y Yamazaki
- Graduate School of Science and Engineering for Research, University of Toyama, Toyama 930-8555, Japan.
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20
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Tanaka K, Mizusawa J, Fukuda H, Araki N, Chuuman H, Takahashi M, Ozaki T, Hiruma T, Tsuchiya H, Morioka H, Morita T, Wada T, Hatori M, Yoshida Y, Toguchida J, Abe S, Matsumine A, Yokoyama R, Iwamoto Y. Adjuvant and neoadjuvant chemotherapy (NAC) with ifosfamide (IFO) and doxorubicin hydrochloride (ADM) for high-grade soft tissue sarcomas (STS) in the extremities: Japan Clinical Oncology Group study JCOG030404. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.10078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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21
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Hibi M, Sugiura Y, Yokoyama R, Takase H, Shiiba D, Meguro S, Katashima M, Shimizu A, Tokimitsu I. The short-term effect of diacylglycerol oil consumption on total and dietary fat utilization in overweight women. Obesity (Silver Spring) 2011; 19:536-40. [PMID: 20814410 DOI: 10.1038/oby.2010.173] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Diacylglycerol (DAG) is a natural component of edible oils with metabolic characteristics distinct from those of triacylglycerol (TAG). Consumption of DAG oil (containing > 80% DAG) induces greater fat oxidation than consumption of TAG oil. We compared the effects of 4 days of DAG oil consumption with those of TAG oil consumption on total and dietary fat oxidation over 24 h in overweight women using a whole-room respiratory chamber. Overweight (BMI (kg/m²) ≥ 25) females participated in this double-blind, crossover-controlled trial. The subjects consumed test diets containing either TAG or DAG oil as 15% of their total caloric intake (mean test oil intake was 33.0 ± 3.1 g/day) during each 4-day treatment. Fat oxidation and energy expenditure were measured in a respiratory chamber on the 4th day of each treatment. Compared with TAG oil, DAG oil consumption significantly increased total fat oxidation and dietary fat oxidation in overweight subjects. Total energy expenditure (TEE) and carbohydrate (CHO) oxidation did not significantly differ between DAG oil and TAG oil consumption in overweight subjects. Compared with TAG oil, DAG oil consumption enhanced total fat oxidation and dietary fat oxidation in overweight subjects. The enhanced fat metabolism in overweight subjects that consumed DAG oil partly explains the greater loss of body weight and body fat related to DAG oil consumption in weight-loss studies.
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Affiliation(s)
- Masanobu Hibi
- Health Care Food Research Laboratories, Kao Corporation, Tokyo, Japan.
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22
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Kamiya N, Zhou X, Chen H, Hara T, Hoshi H, Yokoyama R, Kanematsu M, Fujita H. Automated recognition of the psoas major muscles on X-ray CT images. Annu Int Conf IEEE Eng Med Biol Soc 2010; 2009:3557-60. [PMID: 19963589 DOI: 10.1109/iembs.2009.5332597] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The purpose of this study is to recognize the psoas major muscle on X-ray CT images. For this purpose, we propose a novel recognition method. The recognition process in this method involves three steps: the generation of a shape model for the psoas major muscle, recognition of anatomical points such as the origin and insertion, and the recognition of the psoas major muscles by the use of the shape model. We generated the shape model using 20 CT cases and tested the model for recognition in 20 other CT cases. The average Jaccard similarity coefficient (JSC) and reproducibility rate were 0.704 and 0.783, respectively. Experimental results indicate that our method was effective for a 2-D cross-sectional area (CSA) analysis.
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Affiliation(s)
- N Kamiya
- Department of Intelligent Image Information, Division of Regeneration and Advanced Medical Sciences, Graduate School of Medicine, Gifu University, Yanagido 1-1, Gifu 501-1194, Japan.
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Zhou X, Hayashi T, Chen H, Hara T, Yokoyama R, Kanematsu M, Hoshi H, Fujita H. Automated measurement of bone-mineral-density (BMD) values of vertebral bones based on X-ray torso CT images. Annu Int Conf IEEE Eng Med Biol Soc 2009; 2009:3573-6. [PMID: 19964613 DOI: 10.1109/iembs.2009.5334143] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Bone is one of the most important anatomical structures in humans and osteoporosis is one of the major public health concerns in the world. Osteoporosis is a main target disease of bone, which can be detected by medical image techniques. The purpose of this study is to develop a fully automated computer scheme to measure bone-mineral-density (BMD) values for vertebral trabecular bones. This scheme will aid osteoporosis diagnosis performed using computer tomography (CT) images. This scheme includes the following processing steps: segmentation of the bone region, recognition of the skeletal structures and measurement of the BMD value in vertebral trabecular bone of each vertebral body. The proposed scheme was applied to 20 X-ray torso CT cases to measure the BMD values for vertebral trabecular bones. The experimental results show that the mean and standard deviation of the difference between the BMD values measured by using the proposed method and those measured using a manual segmentation method were 6.93 mg/cm(3) and 6.82 mg/cm(3) respectively. The accuracy of the proposed scheme satisfied the requirement for a computer-aided system used in osteoporosis diagnosis.
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Affiliation(s)
- X Zhou
- Department of Intelligent Image Information, Division of Regeneration and Advanced Medical Sciences, Graduate School of Medicine, Gifu University, Yanagido 1-1, Gifu 501-1194, Japan.
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24
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Hibi M, Takase H, Yasunaga K, Yamaguchi T, Shiiba D, Saito S, Yokoyama R, Kudo N, Katsuragi Y, Meguro S, Shimizu A, Tokimitsu I. Greater fat oxidation with diacylglycerol oil consumption for 14 days compared with triacylglycerol oil consumption in overweight men and women. Int J Obes (Lond) 2008; 32:1841-7. [PMID: 18936764 DOI: 10.1038/ijo.2008.197] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
BACKGROUND Several studies have reported increased fat oxidation with diacylglycerol (DAG) oil consumption. However, the effects of long-term DAG oil consumption on energy metabolism remain to be investigated. OBJECTIVE The objective of this study was to compare the effects of 14 days of either DAG or triacylglycerol (TAG) oil consumption on substrate oxidation, energy expenditure (EE) and dietary fat oxidation. DESIGN Eight males and six females participated in this randomized, double-blind, crossover feeding study. Each patient consumed the 14-day controlled test diet containing either 10 g day(-1) of DAG or TAG oil for acclimatization before a respiratory chamber measurement, followed by a 2-week washout period between diet treatments. Substrate oxidation and EE were measured in the respiratory chamber at the end of each dietary treatment. The patients consumed test oil as 15% of total caloric intake in the respiratory chamber (mean test oil intake was 36.1+/-6.6 g day(-1)). RESULTS Twenty-four hour fat oxidation was significantly greater with 14 days of DAG oil consumption compared with TAG oil consumption (78.6+/-19.6 and 72.6+/-14.9 g day(-1), respectively, P<0.05). There were no differences in body weight or body composition between diet treatments. Dietary fat oxidation was determined using the recovery rate of (13)CO(2) in breath, and was significantly enhanced with DAG oil consumption compared with TAG oil consumption, measured over 22 h after ingestion of (13)C-labelled triolein. Resting metabolic rate (RMR) was significantly greater with DAG oil consumption compared with TAG oil consumption (1766+/-337 and 1680+/-316 kcal day(-1), respectively, P<0.05). CONCLUSION Consumption of DAG oil for 14 days stimulates both fat oxidation and RMR compared with TAG oil consumption, which may explain the greater loss of body weight and body fat with DAG oil consumption that has been observed in weight-loss studies.
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Affiliation(s)
- M Hibi
- Health Care Food Research Laboratories, Kao Corporation, Sumida-ku, Tokyo, Japan.
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25
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Yokoyama R, Harada J, Akiniwa Y. Characterization of strain in cubic thin film with 〈hkl〉 fiber texture in anisotropic stress state. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308079713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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26
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Min Wu, Fang Liu, Peng Shi, Yong He, Yokoyama R. Exponential Stability Analysis for Neural Networks With Time-Varying Delay. ACTA ACUST UNITED AC 2008; 38:1152-6. [DOI: 10.1109/tsmcb.2008.915652] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Takahashi D, Nagayama J, Nagatoshi Y, Inagaki J, Nishiyama K, Yokoyama R, Moriyasu Y, Okada K, Okamura J. Primary Ewing's Sarcoma Family Tumors of the Lung a Case Report and Review of the Literature. Jpn J Clin Oncol 2007; 37:874-7. [DOI: 10.1093/jjco/hym108] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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28
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Hara T, Hirose M, Zhou X, Fujita H, Kiryu T, Yokoyama R, Hoshi H. Nodule detection in 3D chest CT images using 2nd order autocorrelation features. Conf Proc IEEE Eng Med Biol Soc 2007; 2005:6247-9. [PMID: 17281694 DOI: 10.1109/iembs.2005.1615924] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
We have developed a new recognition approach using 2nd order autocorrelation and multi-regression analysis to detect a small (<7mm in diameter) lung nodules in chest 3D CT images. By combining our previous detection method of the template matching based on genetic algorithm, the detection performance was 94% true-positive rate at 2.05 false-positive marks per case using leave-one- out study.
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Affiliation(s)
- T Hara
- department of Intelligent Image Information, Graduate School of Medicine, Gifu University, Gifu, Japan.
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29
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Zhou X, Hara T, Fujita H, Yokoyama R, Kiryu T, Hoshi H, Kanematsu M. Preliminary Study for Automated Recognition of Anatomical Structure from Torso CT images. Conf Proc IEEE Eng Med Biol Soc 2007; 2006:650-3. [PMID: 17282266 DOI: 10.1109/iembs.2005.1616497] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The anatomical human structure recognition is very important and necessary during the development of computer-aided diagnosis (CAD) system. In this paper, we propose an image processing scheme that can recognize the general structure of human torso by identifying the human torso region from CT images automatically and separating it into 7 parts: skin, subcutaneous fat, muscle, bone, diaphragm, thoracic cavity and abdominal cavity based on CT number distribution and spatial relations between different organ and tissue regions. We applied this scheme to 313 patient cases of torso CT images and confirmed its usefulness from the preliminary experiment.
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Affiliation(s)
- X Zhou
- Department of Intelligent Image Information, Division of Regeneration and Advanced Medical Sciences, Graduate School of Medicine, Gifu University, Yanagido 1-1, Gifu 501-1194, Japan. (Tel. & FAX: +81-58-230-6510; )
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Yamashita H, Nakagawa K, Tago M, Nakamura N, Shiraishi K, Eda M, Nakata H, Nagamatsu N, Yokoyama R, Onimura M, Ohtomo K. Taste dysfunction in patients receiving radiotherapy. Head Neck 2006; 28:508-16. [PMID: 16619275 DOI: 10.1002/hed.20347] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
BACKGROUND Taste loss is a major cause of morbidity in patients undergoing head and neck irradiation. METHODS In a prospective study, 51 patients undergoing radical head and neck irradiation at the Tokyo University Hospital were assessed for taste loss. Taste ability was measured by the taste threshold for the four basic tastes (sweet, sour, salt, and bitter qualities) plus another taste of "umami" quality using a filter-paper-disc method in patients before, during, and after radiotherapy (RT). RESULTS All tastes declined on the fifth week after the start of RT and improved on the 11th week. Anatomic pathologic analyses in rats revealed that taste buds diminished completely on the sixth day after irradiation of 15 Gy in a single fraction, and the appearance of taste buds returned almost to the preirradiation state on the 28th day. CONCLUSIONS The main cause of taste disorder resulting from RT was believed to be a disappearance of taste buds and not damage to the taste nerves.
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Affiliation(s)
- Hideomi Yamashita
- Department of Radiology, University of Tokyo Hospital, 7-3-1, Hongo, Tokyo, 113-8655 Japan.
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Yokoyama R, Matsui A, Fujita H, Hara T, Zhou X, Zhang X, Uchiyama Y, Kanematsu M, Hoshi H, Ebi K, Iwama T. Development of an automated method for detection of lacunar infarct regions on brain MR images. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.ics.2005.03.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Teraoka H, Russell C, Regan J, Chandrasekhar A, Concha ML, Yokoyama R, Higashi K, Take-Uchi M, Dong W, Hiraga T, Holder N, Wilson SW. Hedgehog and Fgf signaling pathways regulate the development of tphR-expressing serotonergic raphe neurons in zebrafish embryos. ACTA ACUST UNITED AC 2004; 60:275-88. [PMID: 15281067 PMCID: PMC2789256 DOI: 10.1002/neu.20023] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Serotonin (5HT) plays major roles in the physiological regulation of many behavioral processes, including sleep, feeding, and mood, but the genetic mechanisms by which serotonergic neurons arise during development are poorly understood. In the present study, we have investigated the development of serotonergic neurons in the zebrafish. Neurons exhibiting 5HT-immunoreactivity (5HT-IR) are detected from 45 h postfertilization (hpf) in the ventral hindbrain raphe, the hypothalamus, pineal organ, and pretectal area. Tryptophan hydroxylases encode rate-limiting enzymes that function in the synthesis of 5HT. As part of this study, we cloned and analyzed a novel zebrafish tph gene named tphR. Unlike two other zebrafish tph genes (tphD1 and tphD2), tphR is expressed in serotonergic raphe neurons, similar to tph genes in mammalian species. tphR is also expressed in the pineal organ where it is likely to be involved in the pathway leading to synthesis of melatonin. To better understand the signaling pathways involved in the induction of the serotonergic phenotype, we analyzed tphR expression and 5HT-IR in embryos in which either Hh or Fgf signals are abrogated. Hindbrain 5HT neurons are severely reduced in mutants lacking activity of either Ace/Fgf8 or the transcription factor Noi/Pax2.1, which regulates expression of ace/fgf8, and probably other genes encoding signaling proteins. Similarly, serotonergic raphe neurons are absent in embryos lacking Hh activity confirming a conserved role for Hh signals in the induction of these cells. Conversely, over-activation of the Hh pathway increases the number of serotonergic neurons. As in mammals, our results are consistent with the transcription factors Nk2.2 and Gata3 acting downstream of Hh activity in the development of serotonergic raphe neurons. Our results show that the pathways involved in induction of hindbrain serotonergic neurons are likely to be conserved in all vertebrates and help establish the zebrafish as a model system to study this important neuronal class.
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Affiliation(s)
- H Teraoka
- Department of Anatomy & Developmental Biology, University College London, Gower Street, London, WC1E 6BT, United Kingdom.
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Abstract
Amalignant peripheral nerve-sheath tumour developed in the right S1 nerve root in a man aged 30 causing back pain and sciatica. CT and MRI revealed a destructive tumour of the sacrum invading the retroperitoneal space. The tumour was not resectable with an adequate margin. Chemotherapy, consisting of high-dose ifosfamide followed by a combination of vincristine, doxorubicin and cyclophosphamide, was given with success. Malignant peripheral nerve-sheath tumours are thought to respond weakly to chemotherapy, but the response in our patient was complete.
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Affiliation(s)
- F. Masui
- Department of Orthopaedic Surgery, Jikei University School of Medicine, 3-25-8 Nishisinbashi, Minatoku, Tokyo 105-8461, Japan
| | - R. Yokoyama
- Orthopaedic Division, National Cancer Centre Hospital, 5-1-1 Tsukiji, Chuo-ku, Tokyo 104-0045, Japan
| | - S. Soshi
- Department of Orthopaedic Surgery, Jikei University School of Medicine, 3-25-8 Nishisinbashi, Minatoku, Tokyo 105-8461, Japan
| | - Y. Beppu
- Orthopaedic Division, National Cancer Centre Hospital, 5-1-1 Tsukiji, Chuo-ku, Tokyo 104-0045, Japan
| | - K. Asanuma
- Department of Orthopaedic Surgery, Jikei University School of Medicine, 3-25-8 Nishisinbashi, Minatoku, Tokyo 105-8461, Japan
| | - K. Fujii
- Department of Orthopaedic Surgery, Jikei University School of Medicine, 3-25-8 Nishisinbashi, Minatoku, Tokyo 105-8461, Japan
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Masui F, Yokoyama R, Soshi S, Beppu Y, Asanuma K, Fujii K. A malignant peripheral nerve-sheath tumour responding to chemotherapy. J Bone Joint Surg Br 2004; 86:113-5. [PMID: 14765877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/28/2023]
Abstract
A malignant peripheral nerve-sheath tumour developed in the right S1 nerve root in a man aged 30 causing back pain and sciatica. CT and MRI revealed a destructive tumour of the sacrum invading the retroperitoneal space. The tumour was not resectable with an adequate margin. Chemotherapy, consisting of high-dose ifosfamide followed by a combination of vincristine, doxorubicin and cyclophosphamide, was given with success. Malignant peripheral nerve-sheath tumours are thought to respond weakly to chemotherapy, but the response in our patient was complete.
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Affiliation(s)
- F Masui
- Department of Orthopaedic Surgery, Jikei University School of Medicine, National Cancer Centre Hospital, Tokyo, Japan
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Abstract
AIMS To clarify the prognostic relevance of rosette-like features and other clinicopathological and immunohistochemical variables in patients with osteosarcoma. METHODS Clinicopathological and immunohistochemical variables were analysed in 131 patients with non-metastatic high grade conventional osteosarcoma, with particular attention to the prognostic impact of rosette-like features. RESULTS Rosette-like features were present in 18 (14%) cases. Rosette-like features were significantly associated with the osteoblastic subtype, numerous osteoclast-like giant cells, moderate pleomorphism, frequent haemangiopericytoma-like vascular patterns, epithelioid cytological features, positive immunoreactivity for epithelial membrane antigen and CD56, and negative staining for cytokeratin. In a multivariate analysis, rosette-like features (relative risk (RR), 3.8), a poor chemotherapy effect (RR, 2.9), and a tumour size of 10 cm or more (RR, 2.8) were identified as unfavourable prognostic factors. CONCLUSIONS Rosette-like features can easily be identified from routine histological slides and the relative risk in patients with non-metastatic, conventional osteosarcoma is as high as other well known prognostic factors, including large size and poor chemotherapy effect.
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Affiliation(s)
- K Okada
- Department of Orthopaedic Surgery, Akita University School of Medicine, Akita 010-8543, Japan.
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Sugiura K, Ito K, Yokoyama R, Kumagai S, Onodera T. A model to assess the risk of the introduction into Japan of the bovine spongiform encephalopathy agent through imported animals, meat and meat-and-bone meal. REV SCI TECH OIE 2003; 22:777-94. [PMID: 15005537 DOI: 10.20506/rst.22.3.1434] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The authors developed a mathematical model to assess the release risk of the bovine spongiform encephalopathy (BSE) agent into a country through the importation of live cattle, bone-in bovine meat and meat-and-bone meal (MBM) from the United Kingdom and other countries with BSE. Monte Carlo simulation was attempted using this model and input variables. The release risk in Japan, expressed as the weight of infected MBM released in Japan between 1993 and 2000, was estimated to be 23.4 kg to 53.8 kg. The simulation also indicated that imported MBM represented the most important risk factor for releasing the BSE agent into Japan. This paper also provides details of the first five cases of BSE detected in Japan between September 2001 and the end of 2002. In addition, the results of the investigation conducted to determine the source of infection and the measures taken by the Government of Japan to prevent the BSE agent from entering the food and feed chains are also outlined.
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Affiliation(s)
- K Sugiura
- Animal Health Division, Livestock Industry Department, Agricultural Production Bureau, Ministry of Agriculture, Forestry and Fisheries, 1-2-1 Kasumigaseki, Chiyoda-ku, Tokyo 100-8950, Japan
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Okada K, Hasegawa T, Yokoyama R, Beppu Y, Itoi E. Osteosarcoma with cytokeratin expression: a clinicopathological study of six cases with an emphasis on differential diagnosis from metastatic cancer. J Clin Pathol 2003; 56:742-6. [PMID: 14514776 PMCID: PMC1770076 DOI: 10.1136/jcp.56.10.742] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
AIMS To clarify the clinicopathological profile of osteosarcomas showing an intensely positive immunoreaction for cytokeratin. METHODS Clinicopathological and immunohistochemical features were analysed in 131 patients with non-metastatic, conventional osteosarcoma, treated in Akita University and National Cancer Centre in Tokyo between 1972 and 1999. RESULTS Six patients (4.5%; mean age, 32 years; four men, two women) had osteosarcomas showing intense cytokeratin expression. Tumours were located on the long bones of the extremities in five patients and the ilium in one. Osteoid formations were found in biopsied specimens in all cases. Three tumours were classified as osteoblastic osteosarcoma, two as fibroblastic, and one as chondroblastic. In three tumours classified as the osteoblastic subtype, epithelioid features were prominent, and four tumours showed pronounced cellular pleomorphism. In contrast to the expression of cytokeratin, epithelial membrane antigen was negative in all cases. Surgery with a wide excisional margin was performed in six patients. Preoperative and postoperative chemotherapy was given to five of the six patients, but the effects of these agents were negligible. Three of the six patients developed lung metastases, whereas the other three patients have remained well with no evidence of local recurrence or distant metastasis. CONCLUSIONS Osteosarcoma with intense immunoreaction for cytokeratin was rare. The clinicopathological features were similar to those of patients with conventional osteosarcoma, except for a higher age, chemotherapy resistance, histological epithelioid features, and pleomorphism. This study indicates that osteoid formation and negative expression of epithelial membrane antigen are key features in the differentiation from metastatic carcinoma.
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Affiliation(s)
- K Okada
- Department of Orthopedic Surgery, Akita University School of Medicine, Akita 010-8543, Japan.
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Kumon Y, Yokoyama R, Yokochi T, Honda D, Nakahara T. A new labyrinthulid isolate, which solely produces n-6 docosapentaenoic acid. Appl Microbiol Biotechnol 2003; 63:22-8. [PMID: 12750856 DOI: 10.1007/s00253-003-1333-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2003] [Revised: 03/11/2003] [Accepted: 03/28/2003] [Indexed: 10/26/2022]
Abstract
A labyrinthulid strain, L59, was isolated from a leaf floating on seawater collected at the coastal area of Hokkaido Prefecture, Japan. Strain L59 contained only n-6 docosapentaenoic acid ( n-6 DPA) among all the long-chain polyunsaturated fatty acids. The proportion of n-6 DPA in the total fatty acids was 48.1% and the total fatty acids content in the cell dry weight was 26.6%. Many oil bodies were observed in the cell, mostly in the vicinity of cell membranes. The strain had spindle-shaped cell bodies and all cells were surrounded by ectoplasmic net elements. It was also clearly classified in the labyrinthulid group by phylogenetic analysis. In the optimum culture condition, using soybean oil and peptone as carbon and nitrogen sources, 0.53 g of n-6 DPA/l was produced at 20 degrees C in 7 days.
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Affiliation(s)
- Y Kumon
- National Institute of Advanced Industrial Science and Technology, Higashi 1-1, 305-8566 Tsukuba Ibaraki, Japan.
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Sumitsuji I, Sugano K, Matsui T, Fukayama N, Yamaguchi K, Akasu T, Fujita S, Moriya Y, Yokoyama R, Nomura S, Yoshida T, Kodama T, Ogawa M. Frequent genomic disorganisation of MLH1 in hereditary non-polyposis colorectal cancer (HNPCC) screened by RT-PCR on puromycin treated samples. J Med Genet 2003; 40:e30. [PMID: 12624159 PMCID: PMC1735377 DOI: 10.1136/jmg.40.3.e30] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
MESH Headings
- Adaptor Proteins, Signal Transducing
- Base Sequence
- Carrier Proteins
- Colorectal Neoplasms, Hereditary Nonpolyposis/genetics
- DNA Mutational Analysis
- DNA, Complementary/chemistry
- DNA, Complementary/genetics
- DNA, Neoplasm/chemistry
- DNA, Neoplasm/genetics
- Gene Deletion
- Humans
- Molecular Sequence Data
- MutL Protein Homolog 1
- Mutation
- Neoplasm Proteins/genetics
- Nuclear Proteins
- Protein Synthesis Inhibitors/pharmacology
- Puromycin/pharmacology
- RNA, Messenger/drug effects
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Reverse Transcriptase Polymerase Chain Reaction
- Sequence Deletion
- Sequence Homology, Nucleic Acid
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Affiliation(s)
- I Sumitsuji
- Oncogene Research Unit/Cancer Prevention Unit, Tochigi Cancer Centre Research Institute, Utsunomiya, Tochigi, Japan
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Ozaki T, Schaefer KL, Wai D, Yokoyama R, Ahrens S, Diallo R, Hasegawa T, Shimoda T, Hirohashi S, Kawai A, Naito N, Morimoto Y, Inoue H, Boecker W, Juergens H, Winkelmann W, Dockhorn-Dworniczak B, Poremba C. Population-based genetic alterations in Ewing's tumors from Japanese and European Caucasian patients. Ann Oncol 2002; 13:1656-64. [PMID: 12377657 DOI: 10.1093/annonc/mdf218] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND The incidence of Ewing's tumors (ETs) is lower in Asians or African-Americans than in Caucasians. PATIENTS AND METHODS Japanese ETs were available for analysis of chromosomal aberrations by comparative genomic hybridization (n = 16) and for expression of chimeric EWS transcripts by reverse-transcriptase polymerase chain reaction (n = 11). These results in Japanese patients were compared with those of 62 ETs in European Caucasian patients registered in the European Intergroup Cooperative Ewing's Sarcoma Study. RESULTS Japanese patients with ET had lower overall survival (P = 0.0446) and relapse-free survival (P = 0.0371) compared with European Caucasian patients. Ten of 11 Japanese ETs and 31 of 62 European Caucasian ETs had type I (EWS exon 7 to FLI1 exon 6) fusion transcripts. In Japanese ETs, the median numbers of chromosomal aberrations were 2.0 and 6.0 in 11 primary tumors and five relapsed tumors, respectively. In European Caucasian ETs, the median number of changes were 2.5 and 5.0 in 52 primary and 10 relapsed tumors, respectively. Frequent gains were 8q (38%), 8p (31%) and 12q (25%) in Japanese ETs and 8q (52%), 8p (48%) and 12q (19%) in European Caucasian ETs. Frequent losses were 19q (44%), 19p (38%) and 17p (25%) in Japanese ETs and 16q (21%), 19q (18%) and 17p (15%) in European Caucasian ETs. The incidence of losses of 19p (P = 0.0215) and 19q (P = 0.0277) were significantly higher in Japanese ETs than in European Caucasian ETs. An amplification (1p33-p34) was observed in only one Japanese ET. CONCLUSIONS Japanese patients with ET in this study had a worse prognosis than European Caucasian patients. In molecular genetic analyses, Japanese ETs had a higher frequency of loss of chromosome 19 than European Caucasian ETs. Different genetic aberrations may explain the different incidences and prognoses of ET between Caucasian and Japanese patients.
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Affiliation(s)
- T Ozaki
- Department of Orthopaedics, Westfaelische Wilhelms-University, Münster, Germany
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Yokoyama R, Nishitani K. A comprehensive expression analysis of all members of a gene family encoding cell-wall enzymes allowed us to predict cis-regulatory regions involved in cell-wall construction in specific organs of Arabidopsis. Plant Cell Physiol 2001; 42:1025-33. [PMID: 11673616 DOI: 10.1093/pcp/pce154] [Citation(s) in RCA: 180] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The Arabidopsis thaliana genome sequencing project has revealed that multigene families, such as those generated by genome duplications, are more abundant among plant genomes than among animal genomes. To gain insight into the evolutionary implications of the multigene families in higher plants, we examined the XTH gene family, a group of genes encoding xyloglucan endotransglucosylase/hydrolase, which are responsible for cell-wall construction in plants. Expression analysis of all members (33 genes) of this family, using quantitative real-time RT-PCR, revealed that most members exhibit distinct expression profiles in terms of tissue specificity and responses to hormonal signals, with some members exhibiting similar expression patterns. By comparing the flanking sequences of individual genes, we identified four sets of large-segment duplications and two sets of solitary gene duplications. In each set of gene duplicates, long nucleotide sequences, ranging from one to two hundred base pairs, are conserved. Furthermore, gene duplicates exhibit similar organ-specific expression profiles. These facts allowed us to predict putative cis-regulatory regions, particularly those responsible for cell-wall construction, and hence for morphogenesis, that are specific for certain organs or tissues in plants.
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Affiliation(s)
- R Yokoyama
- Department of Developmental Biology and Neurosciences, Graduate School of Life Sciences, Tohoku University, Sendai, 980-8578 Japan
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Abstract
Osteosarcoma shows a variety of histologic patterns. Rarely, this tumor may appear epithelioid, including a rosettelike configuration simulating glands. We retrospectively reviewed 16 cases of osteosarcoma with rosettelike structures treated at the National Cancer Center and Akita University, Japan, from 1972 to 1999. The 16 patients were under 30 years of age, and males were predominant in the sex distribution. The tumors arose primarily in the metaphysis of long tubular bones, and the most common symptom was pain. Roentgenographically, the lesions showed a highly destructive appearance with varying degrees of mineralization. Twelve patients (75%) died of multiple lung metastases in spite of surgery with wide surgical margins and systemic chemotherapy. The estimated cumulative 5-year survival rate was 15%, significantly worse than the rate of 55% in 70 cases of conventional osteoblastic osteosarcoma without rosettelike structures arising in long tubular bones. All of the 16 tumors, originally classified as conventional osteoblastic osteosarcoma, predominantly displayed a small multinodular growth pattern with lacelike osteoid deposits in the center between dilated blood vessels showing a hemangiopericytoma-like appearance. Ten tumors (63%) showed immunoreactivity for epithelial membrane antigen. We believe rosette formation in osteosarcomas of long tubular bones is an ominous sign; therefore, those tumors should be distinguished from osteosarcomas with conventional morphotypes.
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Affiliation(s)
- K Okada
- Department of Orthopaedics, Akita University School of Medicine, Akita, Japan
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Abstract
We report a case of multiple primary cancers having a germline missense mutation of the p53 gene. The patient was a Japanese female and had a history of five different types of cancers. PCR/direct sequencing analysis revealed the presence of a nucleotide substitution, AGC (Ser) to AGG (Arg), at codon 106 of the p53 gene in DNA from non-cancerous breast tissue. This is the first case of germline p53 mutation at codon 106, and could contribute to establishing correlations between the types and locations of germline p53 mutations and their phenotypical consequences.
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Affiliation(s)
- K Kimura
- Biology Division, National Cancer Center Research Institute, Tokyo, Japan
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Abstract
We studied the clinicopathologic and immunohistochemical features of 20 cases of proximal-type epithelioid sarcoma to identify prognostic factors. The 20 patients ranged in age from 13 to 80 years (mean, 40 y); 12 patients were male and 8 were female. The tumors presented as deep soft-tissue or subcutaneous masses on the inguinal region in five, the thigh in four, the vulva in three, the axilla in three, and one each in the flank, chest wall, back, hip and perineum. The tumors ranged from 2 to 16 cm at their greatest diameter (mean: 7.8 cm). Histologically, 12 tumors (60%) were classified as the large-cell subtype, characterized by sheets of large cells with prominent nucleoli resembling poorly differentiated carcinoma, and a frequent rhabdoid phenotype, six (30%) were classified as the conventional subtype, and two (10%) as the angiomatoid subtype. The numbers of tumors exhibiting immunoreactivity for various markers were: vimentin (20 cytokeratin (20 [100%]); epithelial membrane antigen (17 [85%]); CD34 (9 [45%]); CD99 (5 [25%]); muscle markers, either desmin or alpha-smooth muscle actin (3 [15%]), other markers such as S-100 protein, neurofilament, neuron-specific enolase, synaptophysin and CD56 (12 [60%]); and p53 (16 [80%]). Fourteen lesions (70%) exhibited an MIB-1 index of 30% or more and, by a system of histologic grading using the MIB-1 score, 16 tumors (80%) were classified as high-grade (Grade 3). Thirteen patients (65%) developed local recurrence and 15 (75%) had metastases, primarily to the lymph nodes. At the last follow-up, 13 patients (65%) had died of their disease. A large tumor size and early metastasis were independently associated with a poor outcome. We conclude that proximal-type epithelioid sarcomas are rare, undifferentiated soft-tissue sarcomas of adults, with epithelioid features and a frequent rhabdoid phenotype. These tumors, when arising in proximal locations, have a much worse prognosis than those arising in distal locations.
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Affiliation(s)
- T Hasegawa
- Pathology Division, National Cancer Center Research Institute and Hospital, Tokyo, Japan.
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Yokoyama R, Beppu Y, Tobisu Ki K, Moriya Y, Uchiyama K, Kito M, Umeda T, Hasegawa T, Shimoda T. A multidisciplinary approach to the treatment of malignant pelvic bone tumors: results with eight consecutive patients. J Orthop Sci 2001; 5:449-56. [PMID: 11180901 DOI: 10.1007/s007760070022] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/1999] [Accepted: 03/16/2000] [Indexed: 11/24/2022]
Abstract
The prognosis for malignant pelvic bone tumors is worse than that for malignant bone tumors of the extremities because definitive surgery in the pelvis is often difficult to accomplish. The results for eight patients who were treated consecutively with a multidisciplinary approach, from 1990, were analyzed. The histologic diagnosis was osteosarcoma in five patients, chondrosarcoma in two, and Ewing's sarcoma in one. Five lesions arose in the ilium and three in the pubis. The extraosseous tumors decreased in size and/or were encapsulated as a result of preoperative chemotherapy in six patients, four of these achieving a wide surgical margin. With respect to tumor location and surgical margin, all five lesions in the ilium involved the sacrum, four of these being resected with an inadequate margin. The three lesions in the pubis were resected with an adequate margin. Local recurrence was observed in two patients who had been treated with an inappropriate margin. During the period between 18 and 57 months after the first operation, five patients were continuously free of disease and one was still alive but had lung metastases. Our results indicate that a patient's chances of definitive surgery may be enhanced by a multidisciplinary approach, although the management of sacroiliac involvement remains challenging.
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Affiliation(s)
- R Yokoyama
- Orthopedic Division, National Cancer Center Hospital, 5-1-1 Tsukiji, Chuo-ku, Tokyo 104-0045, Japan
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Huang JM, Yokoyama R, Yang CS, Fukuyama Y. Structure and neurotrophic activity of seco-prezizaane-type sesquiterpenes from Illicium merrillianum. J Nat Prod 2001; 64:428-431. [PMID: 11325221 DOI: 10.1021/np0005715] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
An extract of the pericarps of Illicium merrillianum has yielded four new sesquiterpenes: 3 alpha-hydroxycycloparvifloralone (1), 1,2-dehydrocycloparvifloralone (2), (11) 7,14-ortholactone-3 alpha-hydroxyfloridanolide (3), and 11-O-debenzoyltashironin (4) along with cycloparvifloralone (5), merrillianone (6), and tashironin (7). The structures of 1--4 were determined on the basis of spectroscopic analyses. 11-O-Debenzoyltashironin (4) showed neurotrophic activity in primary culture of rat cortical neurons at 0.1--10 microM. However, cycloparvifloralone-type sesquiterpenes (1, 2, 5, and 6) and tashironin (7) had no neurotrophic activity at these concentrations.
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Affiliation(s)
- J M Huang
- Institute of Pharmacognosy, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan
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Yokoyama R, Nishitani K. Endoxyloglucan transferase is localized both in the cell plate and in the secretory pathway destined for the apoplast in tobacco cells. Plant Cell Physiol 2001; 42:292-300. [PMID: 11266580 DOI: 10.1093/pcp/pce034] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Intracellular trafficking of enzymes responsible for constructing and modifying the cell wall architecture in plants is mostly unknown. To examine their translocation pathways, we employed an endoxyloglucan transferase (EXGT), a key enzyme responsible for forming and rearranging the cellulose/xyloglucan network of the cell wall. We traced its intracellular localization in suspension-cultured cells of tobacco bright yellow-2 by means of green fluorescent protein-fusion gene procedures as well as by indirect immunofluorescence. During interphase the protein was extensively secreted into the apoplast via the endoplasmic reticulum-Golgi apparatus network, whereas during cytokinesis, the protein was exclusively located in the phragmoplast and eventually transported to the cell plate. These results clearly indicate commitment of EXGT protein to the construction of both the cell plate and the cell wall. This study also visualized the process of phragmoplast development at a level of vesicle translocation in the living cell.
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Affiliation(s)
- R Yokoyama
- Biological Institute, Graduate School of Science, Tohoku University, Sendai, 980-8578 Japan
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Abstract
Synovial sarcoma, which has a wide spectrum of biologic behavior, warrants accurate grading to assess the patient's prognosis. We studied the clinicopathologic and immunohistochemical features of 44 cases of synovial sarcoma in patients treated primarily or secondarily at the National Cancer Center, Tokyo, to identify independent prognostic factors. There were local recurrences in 16 patients (36%), and 25 (57%) developed metastases, primarily to the lungs. The estimated cumulative 5-year and 10-year survival rates were 68% and 41%, respectively. Variables associated with an adverse outcome included tumor size > 6.7 cm; initial treatment outside the National Cancer Center; poorly differentiated subtype; high nuclear atypia; mitosis count > 27/10 high-power fields; tumor necrosis; absence of stromal calcification; nuclear expression of beta-catenin, which was found in 25 cases (57%); Ki-67 (MIB-1) index > 27%; and histologic grade 3. Nuclear accumulation of beta-catenin as a cell-signaling event may play an important role in the progression of synovial sarcoma and therefore might be predictive of short survival. However, multivariate analysis clearly showed that only histologic grade, as defined by using categorized variables for the MIB-1 index and tumor necrosis, was an independent prognostic factor. Most variables were correlated with lung metastasis and histologic grade. High-grade synovial sarcoma assessed by a histologic grading system based on the proliferative activity of the neoplastic cells can be viewed as high risk with the patients most likely to die of disease within 10 years after surgery and in need of improved chemotherapy. HUM PATHOL 32:257-263.
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Affiliation(s)
- T Hasegawa
- Pathology Division, National Cancer Center Research Institute and Hospital, Tokyo, Japan
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Hasegawa T, Yokoyama R, Lee YH, Shimoda T, Beppu Y, Hirohashi S. Prognostic relevance of a histological grading system using MIB-1 for adult soft-tissue sarcoma. Oncology 2000; 58:66-74. [PMID: 10644943 DOI: 10.1159/000012081] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Several histological grading systems have been proposed and found as strong indicators of outcome in soft-tissue sarcomas. However, a putative independent prognostic influence of recently developed biological and molecular markers remains to be established. This study investigated the prognostic relevance of a histological grading system based on the assessment of proliferative activity in adult soft-tissue sarcomas of the extremities, trunk, head, and neck. Tissue blocks from 95 of 108 patients without distant metastases or regional lymph node involvement were available. Immunohistochemical staining for MIB-1 and p53 was done on paraffin-embedded sections. All clinicopathologic and immunohistochemical variables and patient survival were assessed using univariate and multivariate analyses. Variables included histological grading based on the modified Fédération Nationale des Centres de Lutte Contre le Cancer (FNCLCC) system using the MIB-1 score for the estimation of the proliferative potential of the tumors. Variables associated with overall survival were tumor site in the trunk, head and neck, mitosis count, necrosis, MIB-1 score, FNCLCC grade, modified FNCLCC grade using the MIB-1 score, and stage (all p values <0.05). In multivariate analysis, the modified grade proved to be the most significant predictor of shortened overall survival, in addition to tumor site in the trunk, head, and neck. Overexpression of p53 did not correlate with increased risk of tumor mortality. Using MIB-1 to replace mitosis counts in the FNCLCC system improves grading of soft-tissue sarcomas, and this in conjunction with other important factors appear to be more accurate prognostic factors for survival, and for patient selection in investigational adjuvant treatment trials.
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Affiliation(s)
- T Hasegawa
- Pathology, National Cancer Center Research Institute and Hospital, Tokyo, Japan.
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