1
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Wilson JN, Thisse D, Lebois M, Jovančević N, Gjestvang D, Canavan R, Rudigier M, Étasse D, Gerst RB, Gaudefroy L, Adamska E, Adsley P, Algora A, Babo M, Belvedere K, Benito J, Benzoni G, Blazhev A, Boso A, Bottoni S, Bunce M, Chakma R, Cieplicka-Oryńczak N, Courtin S, Cortés ML, Davies P, Delafosse C, Fallot M, Fornal B, Fraile L, Gottardo A, Guadilla V, Häfner G, Hauschild K, Heine M, Henrich C, Homm I, Ibrahim F, Iskra ŁW, Ivanov P, Jazrawi S, Korgul A, Koseoglou P, Kröll T, Kurtukian-Nieto T, Le Meur L, Leoni S, Ljungvall J, Lopez-Martens A, Lozeva R, Matea I, Miernik K, Nemer J, Oberstedt S, Paulsen W, Piersa M, Popovitch Y, Porzio C, Qi L, Ralet D, Regan PH, Rezynkina K, Sánchez-Tembleque V, Siem S, Schmitt C, Söderström PA, Sürder C, Tocabens G, Vedia V, Verney D, Warr N, Wasilewska B, Wiederhold J, Yavahchova M, Zeiser F, Ziliani S. Angular momentum generation in nuclear fission. Nature 2021; 590:566-570. [PMID: 33627809 DOI: 10.1038/s41586-021-03304-w] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 12/09/2020] [Indexed: 01/31/2023]
Abstract
When a heavy atomic nucleus splits (fission), the resulting fragments are observed to emerge spinning1; this phenomenon has been a mystery in nuclear physics for over 40 years2,3. The internal generation of typically six or seven units of angular momentum in each fragment is particularly puzzling for systems that start with zero, or almost zero, spin. There are currently no experimental observations that enable decisive discrimination between the many competing theories for the mechanism that generates the angular momentum4-12. Nevertheless, the consensus is that excitation of collective vibrational modes generates the intrinsic spin before the nucleus splits (pre-scission). Here we show that there is no significant correlation between the spins of the fragment partners, which leads us to conclude that angular momentum in fission is actually generated after the nucleus splits (post-scission). We present comprehensive data showing that the average spin is strongly mass-dependent, varying in saw-tooth distributions. We observe no notable dependence of fragment spin on the mass or charge of the partner nucleus, confirming the uncorrelated post-scission nature of the spin mechanism. To explain these observations, we propose that the collective motion of nucleons in the ruptured neck of the fissioning system generates two independent torques, analogous to the snapping of an elastic band. A parameterization based on occupation of angular momentum states according to statistical theory describes the full range of experimental data well. This insight into the role of spin in nuclear fission is not only important for the fundamental understanding and theoretical description of fission, but also has consequences for the γ-ray heating problem in nuclear reactors13,14, for the study of the structure of neutron-rich isotopes15,16, and for the synthesis and stability of super-heavy elements17,18.
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Affiliation(s)
- J N Wilson
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France.
| | - D Thisse
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - M Lebois
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - N Jovančević
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - D Gjestvang
- Department of Physics, University of Oslo, Blindern, Oslo, Norway
| | - R Canavan
- Department of Physics, University of Surrey, Guildford, UK.,National Physical Laboratory, Teddington, UK
| | - M Rudigier
- Department of Physics, University of Surrey, Guildford, UK.,Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany
| | | | - R-B Gerst
- Institut für Kernphysik, Universität zu Köln, Cologne, Germany
| | | | - E Adamska
- Faculty of Physics, University of Warsaw, Warsaw, Poland
| | - P Adsley
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - A Algora
- IFIC, CSIC-University of Valencia, Valencia, Spain.,Institute for Nuclear Research (Atomki), Debrecen, Hungary
| | - M Babo
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - K Belvedere
- Department of Physics, University of Surrey, Guildford, UK
| | - J Benito
- Grupo de Fisica Nuclear & IPARCOS, Universidad Complutense de Madrid, CEI Moncloa, Madrid, Spain
| | | | - A Blazhev
- Institut für Kernphysik, Universität zu Köln, Cologne, Germany
| | - A Boso
- National Physical Laboratory, Teddington, UK
| | - S Bottoni
- INFN, Milan, Italy.,Dipartimento di Fisica, Universitá degli Studi di Milano, Milan, Italy
| | - M Bunce
- National Physical Laboratory, Teddington, UK
| | - R Chakma
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | | | - S Courtin
- Université de Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, France
| | | | - P Davies
- School of Physics and Astronomy, University of Manchester, Manchester, UK
| | - C Delafosse
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - M Fallot
- Subatech, IMT-Atlantique, Université de Nantes, Nantes, France
| | - B Fornal
- Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland
| | - L Fraile
- Grupo de Fisica Nuclear & IPARCOS, Universidad Complutense de Madrid, CEI Moncloa, Madrid, Spain
| | - A Gottardo
- INFN Laboratori Nazionali di Legnaro, Legnaro, Italy
| | - V Guadilla
- Subatech, IMT-Atlantique, Université de Nantes, Nantes, France
| | - G Häfner
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France.,Institut für Kernphysik, Universität zu Köln, Cologne, Germany
| | - K Hauschild
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - M Heine
- Université de Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, France
| | - C Henrich
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany
| | - I Homm
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany
| | - F Ibrahim
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - Ł W Iskra
- INFN, Milan, Italy.,Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland
| | - P Ivanov
- National Physical Laboratory, Teddington, UK
| | - S Jazrawi
- Department of Physics, University of Surrey, Guildford, UK.,National Physical Laboratory, Teddington, UK
| | - A Korgul
- Faculty of Physics, University of Warsaw, Warsaw, Poland
| | - P Koseoglou
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany.,GSI Helmoltzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - T Kröll
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany
| | | | - L Le Meur
- Subatech, IMT-Atlantique, Université de Nantes, Nantes, France
| | - S Leoni
- INFN, Milan, Italy.,Dipartimento di Fisica, Universitá degli Studi di Milano, Milan, Italy
| | - J Ljungvall
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - A Lopez-Martens
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - R Lozeva
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - I Matea
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - K Miernik
- Faculty of Physics, University of Warsaw, Warsaw, Poland
| | - J Nemer
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - S Oberstedt
- European Commission, Joint Research Centre, Geel, Belgium
| | - W Paulsen
- Department of Physics, University of Oslo, Blindern, Oslo, Norway
| | - M Piersa
- Faculty of Physics, University of Warsaw, Warsaw, Poland
| | - Y Popovitch
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - C Porzio
- INFN, Milan, Italy.,Dipartimento di Fisica, Universitá degli Studi di Milano, Milan, Italy.,TRIUMF, Vancouver, British Columbia, Canada
| | - L Qi
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - D Ralet
- Grand Accélérateur National d'Ions Lourds, Caen, France
| | - P H Regan
- Department of Physics, University of Surrey, Guildford, UK.,National Physical Laboratory, Teddington, UK
| | - K Rezynkina
- Institute for Nuclear and Radiation Physics, Katholieke Universiteit Leuven, Leuven, Belgium
| | - V Sánchez-Tembleque
- Grupo de Fisica Nuclear & IPARCOS, Universidad Complutense de Madrid, CEI Moncloa, Madrid, Spain
| | - S Siem
- Department of Physics, University of Oslo, Blindern, Oslo, Norway
| | - C Schmitt
- Université de Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, France
| | - P-A Söderström
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany.,Extreme Light Infrastructure-Nuclear Physics, Horia Hulubei National Institute for Physics and Nuclear Engineering, Bucharest-Măgurele, Romania
| | - C Sürder
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany
| | - G Tocabens
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - V Vedia
- Grupo de Fisica Nuclear & IPARCOS, Universidad Complutense de Madrid, CEI Moncloa, Madrid, Spain
| | - D Verney
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - N Warr
- Institut für Kernphysik, Universität zu Köln, Cologne, Germany
| | - B Wasilewska
- Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland
| | - J Wiederhold
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany
| | - M Yavahchova
- Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - F Zeiser
- Department of Physics, University of Oslo, Blindern, Oslo, Norway
| | - S Ziliani
- INFN, Milan, Italy.,Dipartimento di Fisica, Universitá degli Studi di Milano, Milan, Italy
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Butler PA, Gaffney LP, Spagnoletti P, Konki J, Scheck M, Smith JF, Abrahams K, Bowry M, Cederkäll J, Chupp T, de Angelis G, De Witte H, Garrett PE, Goldkuhle A, Henrich C, Illana A, Johnston K, Joss DT, Keatings JM, Kelly NA, Komorowska M, Kröll T, Lozano M, Singh BSN, O'Donnell D, Ojala J, Page RD, Pedersen LG, Raison C, Reiter P, Rodriguez JA, Rosiak D, Rothe S, Shneidman TM, Siebeck B, Seidlitz M, Sinclair J, Stryjczyk M, Van Duppen P, Vinals S, Virtanen V, Warr N, Wrzosek-Lipska K, Zielinska M. Publisher Correction: The observation of vibrating pear-shapes in radon nuclei. Nat Commun 2020; 11:5185. [PMID: 33037232 PMCID: PMC7547707 DOI: 10.1038/s41467-020-19081-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Affiliation(s)
- P A Butler
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, UK.
| | - L P Gaffney
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, UK.,CERN, Geneva, 23 CH-1211, Switzerland
| | - P Spagnoletti
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - J Konki
- CERN, Geneva, 23 CH-1211, Switzerland
| | - M Scheck
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - J F Smith
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - K Abrahams
- Department of Physics & Astronomy, University of the Western Cape, Private Bag X17, Bellville, 7535, South Africa
| | - M Bowry
- TRIUMF, Vancouver, V6T 2A3, BC, Canada
| | - J Cederkäll
- Physics Department, Lund University, Box 118, Lund, SE-221 00, Sweden
| | - T Chupp
- Department of Physics, University of Michigan, Ann Arbor, 48104 MI, USA
| | - G de Angelis
- INFN Laboratori Nazionali di Legnaro, Legnaro, 35020 PD, Italy
| | - H De Witte
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Leuven, B-3001, Belgium
| | - P E Garrett
- Department of Physics, University of Guelph, Guelph, N1G 2W1, Ontario, Canada
| | - A Goldkuhle
- Institute for Nuclear Physics, University of Cologne, Cologne, 50937, Germany
| | - C Henrich
- Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, 64289, Germany
| | - A Illana
- INFN Laboratori Nazionali di Legnaro, Legnaro, 35020 PD, Italy
| | | | - D T Joss
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, UK
| | - J M Keatings
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - N A Kelly
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - M Komorowska
- Heavy Ion Laboratory, University of Warsaw, Warsaw, PL-02-093, Poland
| | - T Kröll
- Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, 64289, Germany
| | - M Lozano
- CERN, Geneva, 23 CH-1211, Switzerland
| | - B S Nara Singh
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - D O'Donnell
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - J Ojala
- Department of Physics, University of Jyvaskyla, P.O. Box 35, Jyvaskyla, FIN-40014, Finland.,Helsinki Institute of Physics, P.O. Box 64, Helsinki, FIN-00014, Finland
| | - R D Page
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, UK
| | - L G Pedersen
- Department of Physics, University of Oslo, P.O. Box 1048, Oslo, N-0316, Norway
| | - C Raison
- Department of Physics, University of York, York, YO10 5DD, UK
| | - P Reiter
- Institute for Nuclear Physics, University of Cologne, Cologne, 50937, Germany
| | | | - D Rosiak
- Institute for Nuclear Physics, University of Cologne, Cologne, 50937, Germany
| | - S Rothe
- CERN, Geneva, 23 CH-1211, Switzerland
| | | | - B Siebeck
- Institute for Nuclear Physics, University of Cologne, Cologne, 50937, Germany
| | - M Seidlitz
- Institute for Nuclear Physics, University of Cologne, Cologne, 50937, Germany
| | - J Sinclair
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - M Stryjczyk
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Leuven, B-3001, Belgium
| | - P Van Duppen
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Leuven, B-3001, Belgium
| | - S Vinals
- Consejo Superior De Investigaciones Científicas, Madrid, S 28040, Spain
| | - V Virtanen
- Department of Physics, University of Jyvaskyla, P.O. Box 35, Jyvaskyla, FIN-40014, Finland.,Helsinki Institute of Physics, P.O. Box 64, Helsinki, FIN-00014, Finland
| | - N Warr
- Institute for Nuclear Physics, University of Cologne, Cologne, 50937, Germany
| | - K Wrzosek-Lipska
- Heavy Ion Laboratory, University of Warsaw, Warsaw, PL-02-093, Poland
| | - M Zielinska
- IRFU CEA, Université Paris-Saclay, Gif-sur-Yvette, F-91191, France
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Butler PA, Gaffney LP, Spagnoletti P, Konki J, Scheck M, Smith JF, Abrahams K, Bowry M, Cederkäll J, Chupp T, de Angelis G, De Witte H, Garrett PE, Goldkuhle A, Henrich C, Illana A, Johnston K, Joss DT, Keatings JM, Kelly NA, Komorowska M, Kröll T, Lozano M, Singh BSN, O'Donnell D, Ojala J, Page RD, Pedersen LG, Raison C, Reiter P, Rodriguez JA, Rosiak D, Rothe S, Shneidman TM, Siebeck B, Seidlitz M, Sinclair J, Stryjczyk M, Van Duppen P, Vinals S, Virtanen V, Warr N, Wrzosek-Lipska K, Zielinska M. Addendum: The observation of vibrating pear-shapes in radon nuclei. Nat Commun 2020; 11:3560. [PMID: 32661232 PMCID: PMC7359340 DOI: 10.1038/s41467-020-17309-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Affiliation(s)
- P A Butler
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, UK.
| | - L P Gaffney
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, UK.,CERN, Geneva, 23 CH-1211, Switzerland
| | - P Spagnoletti
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - J Konki
- CERN, Geneva, 23 CH-1211, Switzerland
| | - M Scheck
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - J F Smith
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - K Abrahams
- Department of Physics & Astronomy, University of the Western Cape, Private Bag X17, Bellville, 7535, South Africa
| | - M Bowry
- TRIUMF, Vancouver, V6T 2A3, BC, Canada
| | - J Cederkäll
- Physics Department, Lund University, Box 118, Lund, SE-221 00, Sweden
| | - T Chupp
- Department of Physics, University of Michigan, Ann Arbor, 48104, MI, USA
| | - G de Angelis
- INFN Laboratori Nazionali di Legnaro, Legnaro, 35020 PD, Italy
| | - H De Witte
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Leuven, B-3001, Belgium
| | - P E Garrett
- Department of Physics, University of Guelph, Guelph, N1G 2W1, Ontario, Canada
| | - A Goldkuhle
- Institute for Nuclear Physics, University of Cologne, Cologne, 50937, Germany
| | - C Henrich
- Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, 64289, Germany
| | - A Illana
- INFN Laboratori Nazionali di Legnaro, Legnaro, 35020 PD, Italy
| | | | - D T Joss
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, UK
| | - J M Keatings
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - N A Kelly
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - M Komorowska
- Heavy Ion Laboratory, University of Warsaw, Warsaw, PL-02-093, Poland
| | - T Kröll
- Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, 64289, Germany
| | - M Lozano
- CERN, Geneva, 23 CH-1211, Switzerland
| | - B S Nara Singh
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - D O'Donnell
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - J Ojala
- Department of Physics, University of Jyvaskyla, P.O. Box 35, Jyvaskyla, FIN-40014, Finland.,Helsinki Institute of Physics, P.O. Box 64, Helsinki, FIN-00014, Finland
| | - R D Page
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, UK
| | - L G Pedersen
- Department of Physics, University of Oslo, P.O. Box 1048, Oslo, N-0316, Norway
| | - C Raison
- Department of Physics, University of York, York, YO10 5DD, UK
| | - P Reiter
- Institute for Nuclear Physics, University of Cologne, Cologne, 50937, Germany
| | | | - D Rosiak
- Institute for Nuclear Physics, University of Cologne, Cologne, 50937, Germany
| | - S Rothe
- CERN, Geneva, 23 CH-1211, Switzerland
| | | | - B Siebeck
- Institute for Nuclear Physics, University of Cologne, Cologne, 50937, Germany
| | - M Seidlitz
- Institute for Nuclear Physics, University of Cologne, Cologne, 50937, Germany
| | - J Sinclair
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - M Stryjczyk
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Leuven, B-3001, Belgium
| | - P Van Duppen
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Leuven, B-3001, Belgium
| | - S Vinals
- Consejo Superior De Investigaciones Científicas, Madrid, S 28040, Spain
| | - V Virtanen
- Department of Physics, University of Jyvaskyla, P.O. Box 35, Jyvaskyla, FIN-40014, Finland.,Helsinki Institute of Physics, P.O. Box 64, Helsinki, FIN-00014, Finland
| | - N Warr
- Institute for Nuclear Physics, University of Cologne, Cologne, 50937, Germany
| | - K Wrzosek-Lipska
- Heavy Ion Laboratory, University of Warsaw, Warsaw, PL-02-093, Poland
| | - M Zielinska
- IRFU CEA, Université Paris-Saclay, Gif-sur-Yvette, F-91191, France
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4
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Butler PA, Gaffney LP, Spagnoletti P, Abrahams K, Bowry M, Cederkäll J, de Angelis G, De Witte H, Garrett PE, Goldkuhle A, Henrich C, Illana A, Johnston K, Joss DT, Keatings JM, Kelly NA, Komorowska M, Konki J, Kröll T, Lozano M, Nara Singh BS, O'Donnell D, Ojala J, Page RD, Pedersen LG, Raison C, Reiter P, Rodriguez JA, Rosiak D, Rothe S, Scheck M, Seidlitz M, Shneidman TM, Siebeck B, Sinclair J, Smith JF, Stryjczyk M, Van Duppen P, Vinals S, Virtanen V, Warr N, Wrzosek-Lipska K, Zielińska M. Evolution of Octupole Deformation in Radium Nuclei from Coulomb Excitation of Radioactive ^{222}Ra and ^{228}Ra Beams. Phys Rev Lett 2020; 124:042503. [PMID: 32058764 DOI: 10.1103/physrevlett.124.042503] [Citation(s) in RCA: 3] [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] [Received: 11/15/2019] [Indexed: 06/10/2023]
Abstract
There is sparse direct experimental evidence that atomic nuclei can exhibit stable "pear" shapes arising from strong octupole correlations. In order to investigate the nature of octupole collectivity in radium isotopes, electric octupole (E3) matrix elements have been determined for transitions in ^{222,228}Ra nuclei using the method of sub-barrier, multistep Coulomb excitation. Beams of the radioactive radium isotopes were provided by the HIE-ISOLDE facility at CERN. The observed pattern of E3 matrix elements for different nuclear transitions is explained by describing ^{222}Ra as pear shaped with stable octupole deformation, while ^{228}Ra behaves like an octupole vibrator.
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Affiliation(s)
- P A Butler
- University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - L P Gaffney
- University of Liverpool, Liverpool L69 7ZE, United Kingdom
- ISOLDE, CERN, 1211 Geneva 23, Switzerland
| | - P Spagnoletti
- University of the West of Scotland, Paisley PA1 2BE, United Kingdom
| | - K Abrahams
- University of the Western Cape, Private Bag X17, Bellville 7535, South Africa
| | - M Bowry
- University of the West of Scotland, Paisley PA1 2BE, United Kingdom
- TRIUMF, Vancouver V6T 2A3 BC, Canada
| | - J Cederkäll
- Lund University, Box 118, Lund SE-221 00, Sweden
| | - G de Angelis
- INFN Laboratori Nazionali di Legnaro, Legnaro 35020 PD, Italy
| | | | - P E Garrett
- University of Guelph, Guelph N1G 2W1 Ontario, Canada
| | - A Goldkuhle
- University of Cologne, Cologne 50937, Germany
| | - C Henrich
- Technische Universität Darmstadt, Darmstadt 64289, Germany
| | - A Illana
- INFN Laboratori Nazionali di Legnaro, Legnaro 35020 PD, Italy
| | - K Johnston
- ISOLDE, CERN, 1211 Geneva 23, Switzerland
| | - D T Joss
- University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - J M Keatings
- University of the West of Scotland, Paisley PA1 2BE, United Kingdom
| | - N A Kelly
- University of the West of Scotland, Paisley PA1 2BE, United Kingdom
| | - M Komorowska
- Heavy Ion Laboratory, University of Warsaw, Warsaw PL-02-093, Poland
| | - J Konki
- ISOLDE, CERN, 1211 Geneva 23, Switzerland
| | - T Kröll
- Technische Universität Darmstadt, Darmstadt 64289, Germany
| | - M Lozano
- ISOLDE, CERN, 1211 Geneva 23, Switzerland
| | - B S Nara Singh
- University of the West of Scotland, Paisley PA1 2BE, United Kingdom
| | - D O'Donnell
- University of the West of Scotland, Paisley PA1 2BE, United Kingdom
| | - J Ojala
- University of Jyvaskyla, P.O. Box 35, Jyvaskyla FIN-40014, Finland
- Helsinki Institute of Physics, P.O. Box 64, Helsinki FIN-00014, Finland
| | - R D Page
- University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - L G Pedersen
- University of Oslo, P.O. Box 1048, Oslo N-0316, Norway
| | - C Raison
- University of York, York YO10 5DD, United Kingdom
| | - P Reiter
- University of Cologne, Cologne 50937, Germany
| | | | - D Rosiak
- University of Cologne, Cologne 50937, Germany
| | - S Rothe
- ISOLDE, CERN, 1211 Geneva 23, Switzerland
| | - M Scheck
- University of the West of Scotland, Paisley PA1 2BE, United Kingdom
| | - M Seidlitz
- University of Cologne, Cologne 50937, Germany
| | - T M Shneidman
- Joint Institute for Nuclear Research, RU-141980 Dubna, Russian Federation
| | - B Siebeck
- University of Cologne, Cologne 50937, Germany
| | - J Sinclair
- University of the West of Scotland, Paisley PA1 2BE, United Kingdom
| | - J F Smith
- University of the West of Scotland, Paisley PA1 2BE, United Kingdom
| | | | | | - S Vinals
- Consejo Superior De Investigaciones Científicas, Madrid S28040, Spain
| | - V Virtanen
- University of Jyvaskyla, P.O. Box 35, Jyvaskyla FIN-40014, Finland
- Helsinki Institute of Physics, P.O. Box 64, Helsinki FIN-00014, Finland
| | - N Warr
- University of Cologne, Cologne 50937, Germany
| | - K Wrzosek-Lipska
- Heavy Ion Laboratory, University of Warsaw, Warsaw PL-02-093, Poland
| | - M Zielińska
- IRFU CEA, Université Paris-Saclay, Gif-sur-Yvette F-91191, France
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5
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Butler PA, Gaffney LP, Spagnoletti P, Konki J, Scheck M, Smith JF, Abrahams K, Bowry M, Cederkäll J, Chupp T, de Angelis G, De Witte H, Garrett PE, Goldkuhle A, Henrich C, Illana A, Johnston K, Joss DT, Keatings JM, Kelly NA, Komorowska M, Kröll T, Lozano M, Nara Singh BS, O'Donnell D, Ojala J, Page RD, Pedersen LG, Raison C, Reiter P, Rodriguez JA, Rosiak D, Rothe S, Shneidman TM, Siebeck B, Seidlitz M, Sinclair J, Stryjczyk M, Van Duppen P, Vinals S, Virtanen V, Warr N, Wrzosek-Lipska K, Zielinska M. The observation of vibrating pear-shapes in radon nuclei. Nat Commun 2019; 10:2473. [PMID: 31171788 PMCID: PMC6554308 DOI: 10.1038/s41467-019-10494-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Accepted: 05/15/2019] [Indexed: 11/09/2022] Open
Abstract
There is a large body of evidence that atomic nuclei can undergo octupole distortion and assume the shape of a pear. This phenomenon is important for measurements of electric-dipole moments of atoms, which would indicate CP violation and hence probe physics beyond the Standard Model of particle physics. Isotopes of both radon and radium have been identified as candidates for such measurements. Here, we observed the low-lying quantum states in 224Rn and 226Rn by accelerating beams of these radioactive nuclei. We show that radon isotopes undergo octupole vibrations but do not possess static pear-shapes in their ground states. We conclude that radon atoms provide less favourable conditions for the enhancement of a measurable atomic electric-dipole moment.
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Affiliation(s)
- P A Butler
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, UK.
| | - L P Gaffney
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, UK.,CERN, Geneva 23, CH-1211, Switzerland
| | - P Spagnoletti
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - J Konki
- CERN, Geneva 23, CH-1211, Switzerland
| | - M Scheck
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - J F Smith
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - K Abrahams
- Department of Physics & Astronomy, University of the Western Cape, Private Bag X17, Bellville, 7535, South Africa
| | - M Bowry
- TRIUMF, Vancouver, V6T 2A3, BC, Canada
| | - J Cederkäll
- Physics Department, Lund University, Box 118, Lund, SE-221 00, Sweden
| | - T Chupp
- Department of Physics, University of Michigan, Ann Arbor, 48104, MI, USA
| | - G de Angelis
- INFN Laboratori Nazionali di Legnaro, Legnaro, 35020, PD, Italy
| | - H De Witte
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Leuven, B-3001, Belgium
| | - P E Garrett
- Department of Physics, University of Guelph, Guelph, N1G 2W1, Ontario, Canada
| | - A Goldkuhle
- Institute for Nuclear Physics, University of Cologne, Cologne, 50937, Germany
| | - C Henrich
- Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, 64289, Germany
| | - A Illana
- INFN Laboratori Nazionali di Legnaro, Legnaro, 35020, PD, Italy
| | | | - D T Joss
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, UK
| | - J M Keatings
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - N A Kelly
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - M Komorowska
- Heavy Ion Laboratory, University of Warsaw, Warsaw, PL-02-093, Poland
| | - T Kröll
- Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, 64289, Germany
| | - M Lozano
- CERN, Geneva 23, CH-1211, Switzerland
| | - B S Nara Singh
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - D O'Donnell
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - J Ojala
- Department of Physics, University of Jyvaskyla, P.O. Box 35, Jyvaskyla, FIN-40014, Finland.,Helsinki Institute of Physics, P.O. Box 64, Helsinki, FIN-00014, Finland
| | - R D Page
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, UK
| | - L G Pedersen
- Department of Physics, University of Oslo, P.O. Box 1048, Oslo, N-0316, Norway
| | - C Raison
- Department of Physics, University of York, York, YO10 5DD, UK
| | - P Reiter
- Institute for Nuclear Physics, University of Cologne, Cologne, 50937, Germany
| | | | - D Rosiak
- Institute for Nuclear Physics, University of Cologne, Cologne, 50937, Germany
| | - S Rothe
- CERN, Geneva 23, CH-1211, Switzerland
| | | | - B Siebeck
- Institute for Nuclear Physics, University of Cologne, Cologne, 50937, Germany
| | - M Seidlitz
- Institute for Nuclear Physics, University of Cologne, Cologne, 50937, Germany
| | - J Sinclair
- School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
| | - M Stryjczyk
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Leuven, B-3001, Belgium
| | - P Van Duppen
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Leuven, B-3001, Belgium
| | - S Vinals
- Consejo Superior De Investigaciones Científicas, Madrid, S 28040, Spain
| | - V Virtanen
- Department of Physics, University of Jyvaskyla, P.O. Box 35, Jyvaskyla, FIN-40014, Finland.,Helsinki Institute of Physics, P.O. Box 64, Helsinki, FIN-00014, Finland
| | - N Warr
- Institute for Nuclear Physics, University of Cologne, Cologne, 50937, Germany
| | - K Wrzosek-Lipska
- Heavy Ion Laboratory, University of Warsaw, Warsaw, PL-02-093, Poland
| | - M Zielinska
- IRFU CEA, Université Paris-Saclay, Gif-sur-Yvette, F-91191, France
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6
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Revel A, Marqués FM, Sorlin O, Aumann T, Caesar C, Holl M, Panin V, Vandebrouck M, Wamers F, Alvarez-Pol H, Atar L, Avdeichikov V, Beceiro-Novo S, Bemmerer D, Benlliure J, Bertulani CA, Boillos JM, Boretzky K, Borge MJG, Caamaño M, Casarejos E, Catford WN, Cederkäll J, Chartier M, Chulkov L, Cortina-Gil D, Cravo E, Crespo R, Datta Pramanik U, Díaz Fernández P, Dillmann I, Elekes Z, Enders J, Ershova O, Estradé A, Farinon F, Fraile LM, Freer M, Galaviz D, Geissel H, Gernhäuser R, Golubev P, Göbel K, Hagdahl J, Heftrich T, Heil M, Heine M, Heinz A, Henriques A, Ignatov A, Johansson HT, Jonson B, Kahlbow J, Kalantar-Nayestanaki N, Kanungo R, Kelic-Heil A, Knyazev A, Kröll T, Kurz N, Labiche M, Langer C, Le Bleis T, Lemmon R, Lindberg S, Machado J, Marganiec J, Movsesyan A, Nacher E, Najafi M, Nilsson T, Nociforo C, Paschalis S, Perea A, Petri M, Pietri S, Plag R, Reifarth R, Ribeiro G, Rigollet C, Röder M, Rossi D, Savran D, Scheit H, Simon H, Syndikus I, Taylor JT, Tengblad O, Thies R, Togano Y, Velho P, Volkov V, Wagner A, Weick H, Wheldon C, Wilson G, Winfield JS, Woods P, Yakorev D, Zhukov M, Zilges A, Zuber K. Strong Neutron Pairing in core+4n Nuclei. Phys Rev Lett 2018; 120:152504. [PMID: 29756867 DOI: 10.1103/physrevlett.120.152504] [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: 01/08/2018] [Revised: 02/17/2018] [Indexed: 06/08/2023]
Abstract
The emission of neutron pairs from the neutron-rich N=12 isotones ^{18}C and ^{20}O has been studied by high-energy nucleon knockout from ^{19}N and ^{21}O secondary beams, populating unbound states of the two isotones up to 15 MeV above their two-neutron emission thresholds. The analysis of triple fragment-n-n correlations shows that the decay ^{19}N(-1p)^{18}C^{*}→^{16}C+n+n is clearly dominated by direct pair emission. The two-neutron correlation strength, the largest ever observed, suggests the predominance of a ^{14}C core surrounded by four valence neutrons arranged in strongly correlated pairs. On the other hand, a significant competition of a sequential branch is found in the decay ^{21}O(-1n)^{20}O^{*}→^{18}O+n+n, attributed to its formation through the knockout of a deeply bound neutron that breaks the ^{16}O core and reduces the number of pairs.
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Affiliation(s)
- A Revel
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Bvd Henri Becquerel, 14076 Caen, France
- LPC Caen, ENSICAEN, Université de Caen, CNRS/IN2P3, F-14050 CAEN Cedex, France
| | - F M Marqués
- LPC Caen, ENSICAEN, Université de Caen, CNRS/IN2P3, F-14050 CAEN Cedex, France
| | - O Sorlin
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Bvd Henri Becquerel, 14076 Caen, France
| | - T Aumann
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - C Caesar
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - M Holl
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - V Panin
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - M Vandebrouck
- Irfu, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
| | - F Wamers
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - H Alvarez-Pol
- IGFAE, Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - L Atar
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - V Avdeichikov
- Department of Physics, Lund University, 22100 Lund, Sweden
| | - S Beceiro-Novo
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - D Bemmerer
- Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
| | - J Benlliure
- IGFAE, Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - C A Bertulani
- Department of Physics and Astronomy, Texas A&M University-Commerce, Commerce, Texas 75429, USA
| | - J M Boillos
- IGFAE, Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - K Boretzky
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - M J G Borge
- Instituto de Estructura de la Materia, CSIC, Serrano 113 bis, 28006 Madrid, Spain
| | - M Caamaño
- IGFAE, Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | | | - W N Catford
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - J Cederkäll
- Department of Physics, Lund University, 22100 Lund, Sweden
| | - M Chartier
- Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - L Chulkov
- NRC Kurchatov Institute, Ru-123182 Moscow, Russia
- ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - D Cortina-Gil
- IGFAE, Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - E Cravo
- Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
| | - R Crespo
- Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
| | - U Datta Pramanik
- Saha Institute of Nuclear Physics, 1/AF Bidhan Nagar, Kolkata 700064, India
| | - P Díaz Fernández
- IGFAE, Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - I Dillmann
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
- II. Physikalisches Institut, Universität Gieß en, 35392 Gießen, Germany
| | - Z Elekes
- MTA Atomki, 4001 Debrecen, Hungary
| | - J Enders
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - O Ershova
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - A Estradé
- School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
| | - F Farinon
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - L M Fraile
- Grupo de Física Nuclear y UPARCOS, Universidad Complutense de Madrid, CEI Moncloa, 28040 Madrid, Spain
| | - M Freer
- School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - D Galaviz
- Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
- Laboratório de Instrumentação e Física Experimental de Partículas-LIP, 1000-149 Lisbon, Portugal
| | - H Geissel
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - R Gernhäuser
- Physik Department E12, Technische Universität München, 85748 Garching, Germany
| | - P Golubev
- Department of Physics, Lund University, 22100 Lund, Sweden
| | - K Göbel
- Goethe-Universität Frankfurt am Main, 60438 Frankfurt am Main, Germany
| | - J Hagdahl
- Institutionen för Fysik, Chalmers Tekniska Högskola, 412 96 Göteborg, Sweden
| | - T Heftrich
- Goethe-Universität Frankfurt am Main, 60438 Frankfurt am Main, Germany
| | - M Heil
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - M Heine
- IPHC-CNRS/Université de Strasbourg, 67037 Strasbourg, France
| | - A Heinz
- Institutionen för Fysik, Chalmers Tekniska Högskola, 412 96 Göteborg, Sweden
| | - A Henriques
- Laboratório de Instrumentação e Física Experimental de Partículas-LIP, 1000-149 Lisbon, Portugal
| | - A Ignatov
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - H T Johansson
- Institutionen för Fysik, Chalmers Tekniska Högskola, 412 96 Göteborg, Sweden
| | - B Jonson
- Institutionen för Fysik, Chalmers Tekniska Högskola, 412 96 Göteborg, Sweden
| | - J Kahlbow
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | | | - R Kanungo
- Astronomy and Physics Department, Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada
| | - A Kelic-Heil
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - A Knyazev
- Department of Physics, Lund University, 22100 Lund, Sweden
| | - T Kröll
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - N Kurz
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - M Labiche
- STFC Daresbury Laboratory, WA4 4AD Warrington, United Kingdom
| | - C Langer
- Goethe-Universität Frankfurt am Main, 60438 Frankfurt am Main, Germany
| | - T Le Bleis
- Physik Department E12, Technische Universität München, 85748 Garching, Germany
| | - R Lemmon
- STFC Daresbury Laboratory, WA4 4AD Warrington, United Kingdom
| | - S Lindberg
- Institutionen för Fysik, Chalmers Tekniska Högskola, 412 96 Göteborg, Sweden
| | - J Machado
- Laboratório de Instrumentação, Engenharia Biomédica e Física da Radiação (LIBPhysUNL), Departamento de Física, Faculdade de Ciências e Tecnologias, Universidade Nova de Lisboa, 2829-516 Monte da Caparica, Portugal
| | - J Marganiec
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
- ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - A Movsesyan
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - E Nacher
- Instituto de Estructura de la Materia, CSIC, Serrano 113 bis, 28006 Madrid, Spain
| | - M Najafi
- KVI-CART, University of Groningen, Zernikelaan 25, 9747 AA Groningen, The Netherlands
| | - T Nilsson
- Institutionen för Fysik, Chalmers Tekniska Högskola, 412 96 Göteborg, Sweden
| | - C Nociforo
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - S Paschalis
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
| | - A Perea
- Instituto de Estructura de la Materia, CSIC, Serrano 113 bis, 28006 Madrid, Spain
| | - M Petri
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
| | - S Pietri
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - R Plag
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - R Reifarth
- Goethe-Universität Frankfurt am Main, 60438 Frankfurt am Main, Germany
| | - G Ribeiro
- Instituto de Estructura de la Materia, CSIC, Serrano 113 bis, 28006 Madrid, Spain
| | - C Rigollet
- KVI-CART, University of Groningen, Zernikelaan 25, 9747 AA Groningen, The Netherlands
| | - M Röder
- Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
- Institut für Kern- und Teilchenphysik, Technische Universität Dresden, 01069 Dresden, Germany
| | - D Rossi
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - D Savran
- ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - H Scheit
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - H Simon
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - I Syndikus
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - J T Taylor
- Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - O Tengblad
- Instituto de Estructura de la Materia, CSIC, Serrano 113 bis, 28006 Madrid, Spain
| | - R Thies
- Institutionen för Fysik, Chalmers Tekniska Högskola, 412 96 Göteborg, Sweden
| | - Y Togano
- Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8551, Japan
| | - P Velho
- Laboratório de Instrumentação e Física Experimental de Partículas-LIP, 1000-149 Lisbon, Portugal
| | - V Volkov
- NRC Kurchatov Institute, Ru-123182 Moscow, Russia
| | - A Wagner
- Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
| | - H Weick
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - C Wheldon
- School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - G Wilson
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - J S Winfield
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - P Woods
- School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
| | - D Yakorev
- Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
| | - M Zhukov
- Institutionen för Fysik, Chalmers Tekniska Högskola, 412 96 Göteborg, Sweden
| | - A Zilges
- Institut für Kernphysik, Universität zu Köln, 50937 Köln, Germany
| | - K Zuber
- Institut für Kern- und Teilchenphysik, Technische Universität Dresden, 01069 Dresden, Germany
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7
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Atar L, Paschalis S, Barbieri C, Bertulani CA, Díaz Fernández P, Holl M, Najafi MA, Panin V, Alvarez-Pol H, Aumann T, Avdeichikov V, Beceiro-Novo S, Bemmerer D, Benlliure J, Boillos JM, Boretzky K, Borge MJG, Caamaño M, Caesar C, Casarejos E, Catford W, Cederkall J, Chartier M, Chulkov L, Cortina-Gil D, Cravo E, Crespo R, Dillmann I, Elekes Z, Enders J, Ershova O, Estrade A, Farinon F, Fraile LM, Freer M, Galaviz Redondo D, Geissel H, Gernhäuser R, Golubev P, Göbel K, Hagdahl J, Heftrich T, Heil M, Heine M, Heinz A, Henriques A, Hufnagel A, Ignatov A, Johansson HT, Jonson B, Kahlbow J, Kalantar-Nayestanaki N, Kanungo R, Kelic-Heil A, Knyazev A, Kröll T, Kurz N, Labiche M, Langer C, Le Bleis T, Lemmon R, Lindberg S, Machado J, Marganiec-Gałązka J, Movsesyan A, Nacher E, Nikolskii EY, Nilsson T, Nociforo C, Perea A, Petri M, Pietri S, Plag R, Reifarth R, Ribeiro G, Rigollet C, Rossi DM, Röder M, Savran D, Scheit H, Simon H, Sorlin O, Syndikus I, Taylor JT, Tengblad O, Thies R, Togano Y, Vandebrouck M, Velho P, Volkov V, Wagner A, Wamers F, Weick H, Wheldon C, Wilson GL, Winfield JS, Woods P, Yakorev D, Zhukov M, Zilges A, Zuber K. Quasifree (p, 2p) Reactions on Oxygen Isotopes: Observation of Isospin Independence of the Reduced Single-Particle Strength. Phys Rev Lett 2018; 120:052501. [PMID: 29481189 DOI: 10.1103/physrevlett.120.052501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 11/08/2017] [Indexed: 06/08/2023]
Abstract
Quasifree one-proton knockout reactions have been employed in inverse kinematics for a systematic study of the structure of stable and exotic oxygen isotopes at the R^{3}B/LAND setup with incident beam energies in the range of 300-450 MeV/u. The oxygen isotopic chain offers a large variation of separation energies that allows for a quantitative understanding of single-particle strength with changing isospin asymmetry. Quasifree knockout reactions provide a complementary approach to intermediate-energy one-nucleon removal reactions. Inclusive cross sections for quasifree knockout reactions of the type ^{A}O(p,2p)^{A-1}N have been determined and compared to calculations based on the eikonal reaction theory. The reduction factors for the single-particle strength with respect to the independent-particle model were obtained and compared to state-of-the-art ab initio predictions. The results do not show any significant dependence on proton-neutron asymmetry.
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Affiliation(s)
- L Atar
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - S Paschalis
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- Department of Physics, University of York, York YO10 5DD, United Kingdom
| | - C Barbieri
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - C A Bertulani
- Texas A&M University-Commerce, 75428 Commerce, Texas, United States of America
| | - P Díaz Fernández
- Departamento de Física de Partículas, Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain
| | - M Holl
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - M A Najafi
- KVI-CART, University of Groningen, Zernikelaan 25, 9747 AA Groningen, Netherlands
| | - V Panin
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- RIKEN, Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, 351-0198 Wako, Saitama, Japan
| | - H Alvarez-Pol
- Departamento de Física de Partículas, Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain
| | - T Aumann
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - V Avdeichikov
- Department of Physics, Lund University, 22100 Lund, Sweden
| | - S Beceiro-Novo
- Departamento de Física de Partículas, Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain
| | - D Bemmerer
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiation Physics, P.O.B. 510119, 01314 Dresden, Germany
| | - J Benlliure
- Departamento de Física de Partículas, Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain
| | - J M Boillos
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
- Departamento de Física de Partículas, Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain
| | - K Boretzky
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - M J G Borge
- Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
| | - M Caamaño
- Departamento de Física de Partículas, Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain
| | - C Caesar
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | | | - W Catford
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - J Cederkall
- Department of Physics, Lund University, 22100 Lund, Sweden
| | - M Chartier
- University of Liverpool, L69 3BX Liverpool, United Kingdom
| | - L Chulkov
- NRC Kurchatov Institute, place Akademika Kurchatova, Moscow 123182, Russia
| | - D Cortina-Gil
- Departamento de Física de Partículas, Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain
| | - E Cravo
- Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
| | - R Crespo
- Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
| | - I Dillmann
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
- Justus-Liebig-Universität Gießen, 35392 Gießen, Germany
| | - Z Elekes
- ATOMKI Debrecen, Bem tér 18/c, 4026 Debrecen, Hungary
| | - J Enders
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - O Ershova
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - A Estrade
- University of Edinburgh, EH8 9YL Edinburgh, United Kingdom
| | - F Farinon
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - L M Fraile
- Grupo de Física Nuclear & IPARCOS, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - M Freer
- University of Birmingham, B15 2TT Birmingham, United Kingdom
| | - D Galaviz Redondo
- Nuclear Physics Center, University of Lisbon, 1649-003 Lisboa, Portugal
| | - H Geissel
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
- Justus-Liebig-Universität Gießen, 35392 Gießen, Germany
| | - R Gernhäuser
- Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
| | - P Golubev
- Department of Physics, Lund University, 22100 Lund, Sweden
| | - K Göbel
- Goethe-Universität Frankfurt, Max-von-Laue Straße 1, 60438 Frankfurt am Main, Germany
| | - J Hagdahl
- Chalmers University of Technology, Kemivägen 9, 412 96 Göteborg, Sweden
| | - T Heftrich
- Goethe-Universität Frankfurt, Max-von-Laue Straße 1, 60438 Frankfurt am Main, Germany
| | - M Heil
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - M Heine
- IPHC-CNRS/Université de Strasbourg, 67037 Strasbourg, France
| | - A Heinz
- Chalmers University of Technology, Kemivägen 9, 412 96 Göteborg, Sweden
| | - A Henriques
- Nuclear Physics Center, University of Lisbon, 1649-003 Lisboa, Portugal
| | - A Hufnagel
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - A Ignatov
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - H T Johansson
- Chalmers University of Technology, Kemivägen 9, 412 96 Göteborg, Sweden
| | - B Jonson
- Chalmers University of Technology, Kemivägen 9, 412 96 Göteborg, Sweden
| | - J Kahlbow
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | | | - R Kanungo
- Saint Mary's University, 923 Robie Street, B3H 3C3 Halifax, Nova Scotia, Canada
| | - A Kelic-Heil
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - A Knyazev
- Department of Physics, Lund University, 22100 Lund, Sweden
| | - T Kröll
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - N Kurz
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - M Labiche
- Science and Technology Facilities Council-Daresbury Laboratory, WA4 4AD Warrington, United Kingdom
| | - C Langer
- Goethe-Universität Frankfurt, Max-von-Laue Straße 1, 60438 Frankfurt am Main, Germany
| | - T Le Bleis
- Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
| | - R Lemmon
- Science and Technology Facilities Council-Daresbury Laboratory, WA4 4AD Warrington, United Kingdom
| | - S Lindberg
- Chalmers University of Technology, Kemivägen 9, 412 96 Göteborg, Sweden
| | - J Machado
- Nuclear Physics Center, University of Lisbon, 1649-003 Lisboa, Portugal
| | - J Marganiec-Gałązka
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
- Extreme Matter Institute, GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - A Movsesyan
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - E Nacher
- Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
| | - E Y Nikolskii
- NRC Kurchatov Institute, place Akademika Kurchatova, Moscow 123182, Russia
| | - T Nilsson
- Chalmers University of Technology, Kemivägen 9, 412 96 Göteborg, Sweden
| | - C Nociforo
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - A Perea
- Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
| | - M Petri
- Department of Physics, University of York, York YO10 5DD, United Kingdom
| | - S Pietri
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - R Plag
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - R Reifarth
- Goethe-Universität Frankfurt, Max-von-Laue Straße 1, 60438 Frankfurt am Main, Germany
| | - G Ribeiro
- Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
| | - C Rigollet
- KVI-CART, University of Groningen, Zernikelaan 25, 9747 AA Groningen, Netherlands
| | - D M Rossi
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - M Röder
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiation Physics, P.O.B. 510119, 01314 Dresden, Germany
- Technische Universität Dresden, Institut für Kern- und Teilchenphysik, Zellescher Weg 19, 01069 Dresden, Germany
| | - D Savran
- Extreme Matter Institute, GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - H Scheit
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - H Simon
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - O Sorlin
- GANIL, Boulevard Henri Becquerel, 14076 Caen, France
| | - I Syndikus
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - J T Taylor
- University of Liverpool, L69 3BX Liverpool, United Kingdom
| | - O Tengblad
- Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
| | - R Thies
- Chalmers University of Technology, Kemivägen 9, 412 96 Göteborg, Sweden
| | - Y Togano
- RIKEN, Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, 351-0198 Wako, Saitama, Japan
| | - M Vandebrouck
- GANIL, Boulevard Henri Becquerel, 14076 Caen, France
| | - P Velho
- Nuclear Physics Center, University of Lisbon, 1649-003 Lisboa, Portugal
| | - V Volkov
- NRC Kurchatov Institute, place Akademika Kurchatova, Moscow 123182, Russia
| | - A Wagner
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiation Physics, P.O.B. 510119, 01314 Dresden, Germany
| | - F Wamers
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - H Weick
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
| | - C Wheldon
- University of Birmingham, B15 2TT Birmingham, United Kingdom
| | - G L Wilson
- University of Surrey, GU2 7XH Surrey, United Kingdom
| | - J S Winfield
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany
- Justus-Liebig-Universität Gießen, 35392 Gießen, Germany
| | - P Woods
- University of Edinburgh, EH8 9YL Edinburgh, United Kingdom
| | - D Yakorev
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiation Physics, P.O.B. 510119, 01314 Dresden, Germany
| | - M Zhukov
- Chalmers University of Technology, Kemivägen 9, 412 96 Göteborg, Sweden
| | - A Zilges
- Universität zu Köln, Institut für Kernphysik, Zülpicher Straße 77, 50937 Köln, Germany
| | - K Zuber
- Technische Universität Dresden, Institut für Kern- und Teilchenphysik, Zellescher Weg 19, 01069 Dresden, Germany
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Ansari S, Régis JM, Jolie J, Saed-Samii N, Warr N, Korten W, Zielińska M, Salsac MD, Blanc A, Jentschel M, Köster U, Mutti P, Soldner T, Simpson G, Drouet F, Vancraeyenest A, de France G, Clément E, Stezowski O, Ur C, Urban W, Regan P, Podolyák Z, Larijani C, Townsley C, Carroll R, Wilson E, Mach H, Fraile L, Paziy V, Olaizola B, Vedia V, Bruce A, Roberts O, Smith J, Scheck M, Kröll T, Hartig AL, Ignatov A, Ilieva S, Lalkovski S, Mărginean N, Otsuka T, Shimizu N, Togashi T, Tsunoda Y. Lifetime measurement in neutron-rich A~100 nuclei. EPJ Web Conf 2018. [DOI: 10.1051/epjconf/201819305003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Lifetimes of excited states of the 98;100;102Zr nuclei were measured by using the Generalized Centroid Difference Method. The nuclei of interest were populated via neutron-induced fission of 241Pu and 235U during the EXILL-FATIMA campaign. The obtained lifetimes were used to calculate the B(E2) transition strengths and β deformation parameters which were then compared with the recent theoretical predictions obtained with Monte Carlo Shell Model.
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Gamba E, Lalkovski S, Rudigier M, Bruce A, Bottoni S, Carpenter M, Zhu S, Ayangeakaa A, Anderson J, Berry T, Burrows I, Carroll R, Copp P, Carmona Gallardo M, Cullen D, Daniel T, Greene J, Gurgi L, Hartley D, Ilieva R, Ilieva S, Janssens R, Kondev F, Kröll T, Lane G, Lauritsen T, Lazarus I, Lotay G, Fernández Martínez G, Podolyák Z, Pucknell V, Reed M, Regan P, Rohrer J, Sethi J, Seweryniak D, Shand C, Simpson J, Smolen M, Stefanova E, Vedia V, Yordanov O. Fast-timing measurements in neutron-rich odd-mass zirconium isotopes using LaBr 3:Ce detectors coupled with Gammasphere. EPJ Web Conf 2018. [DOI: 10.1051/epjconf/201819305004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
A fast-timing experiment was performed at the Argonne National Laboratory to measure the lifetimes of the lowest lying states of nuclei belonging to the deformed regions around mass number A≃110 and A≃150. These regions were populated via spontaneous fission of 252Cf and the gamma radiation following the decay of excited states in the fission fragments was measured using 51 Gammasphere detectors coupled with 25 LaBr3:Ce detectors. A brief description of the acquisition system and some preliminary results from the fast-timing analysis of the fission fragment 100Zr are presented. The lifetime value of τ = 840(65) ps was found for the 2+ state in 100Zr consistent within one standard deviation of the adopted value with 791 +26 -35ps. This is associated with a quadrupole deformation parameter of 0.36(2) which is within one standard deviation of the literature value of 0.3556+82 -57.
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10
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Régis JM, Simpson G, Mach H, Blanc A, Jentschel M, Köster U, Mutti P, Soldner T, de France G, Ur C, Urban W, Jolie J, Saed-Samii N, Warr N, Fraile L, Paziy V, Regan P, Podolyák Z, Lalkovski S, Bruce A, Kröll T, Korten W, Marginean N. The γ-γ fast-timing technique and the EXILL&FATIMA campaign. EPJ Web Conf 2018. [DOI: 10.1051/epjconf/201819304008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
At the Institut Laue-Langevin in Grenoble, germanium-gated γ-γ fast-timing lifetime measurements of nuclear excited states in neutron-rich nuclei have been performed within a prompt γ-ray spectroscopy experimental campaign. We report on results obtained from the cold-neutron induced fission of 235U. The excited secondary fission products were stopped almost instantaneously within the thick target and the γ rays emitted were collected triggerlessly using the EXILL&FATIMA mixed array of HPGe and LaBr3(Ce) detectors. Precise lifetimes could be determined by analysing the γ-γ time difference spectra using the generalized centroid difference method. This picosecondsensitive method provides many advantages and is briefly explained. Still, the major source of systematic errors is related to the contribution of time-correlated Compton background. The EXILL&FATIMA results are discussed with respect to the typical energy-dependent timing behaviour of the background. According to the time response of the background, appropriate methods and a time correction for the sub-nanosecond regime are proposed.
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11
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Sotty C, Zielińska M, Georgiev G, Balabanski DL, Stuchbery AE, Blazhev A, Bree N, Chevrier R, Das Gupta S, Daugas JM, Davinson T, De Witte H, Diriken J, Gaffney LP, Geibel K, Hadyńska-Klek K, Kondev FG, Konki J, Kröll T, Morel P, Napiorkowski P, Pakarinen J, Reiter P, Scheck M, Seidlitz M, Siebeck B, Simpson G, Törnqvist H, Warr N, Wenander F. Publisher's Note: (37)(97)Rb(60): The Cornerstone of the Region of Deformation around A∼100 [Phys. Rev. Lett. 115, 172501 (2015)]. Phys Rev Lett 2015; 115:209902. [PMID: 26613483 DOI: 10.1103/physrevlett.115.209902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Indexed: 06/05/2023]
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12
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Sotty C, Zielińska M, Georgiev G, Balabanski DL, Stuchbery AE, Blazhev A, Bree N, Chevrier R, Das Gupta S, Daugas JM, Davinson T, De Witte H, Diriken J, Gaffney LP, Geibel K, Hadyńska-Klȩk K, Kondev FG, Konki J, Kröll T, Morel P, Napiorkowski P, Pakarinen J, Reiter P, Scheck M, Seidlitz M, Siebeck B, Simpson G, Törnqvist H, Warr N, Wenander F. (97)(37)Rb(60): The Cornerstone of the Region of Deformation around A ∼ 100 [corrected]. Phys Rev Lett 2015; 115:172501. [PMID: 26551106 DOI: 10.1103/physrevlett.115.172501] [Citation(s) in RCA: 1] [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] [Received: 08/03/2015] [Indexed: 06/05/2023]
Abstract
Excited states of the neutron-rich nuclei (97,99)Rb were populated for the first time using the multistep Coulomb excitation of radioactive beams. Comparisons of the results with particle-rotor model calculations provide clear identification for the ground-state rotational band of (97)Rb as being built on the πg(9/2) [431] 3/2(+) Nilsson-model configuration. The ground-state excitation spectra of the Rb isotopes show a marked distinction between single-particle-like structures below N=60 and rotational bands above. The present study defines the limits of the deformed region around A∼100 and indicates that the deformation of (97)Rb is essentially the same as that observed well inside the deformed region. It further highlights the power of the Coulomb-excitation technique for obtaining spectroscopic information far from stability. The (99)Rb case demonstrates the challenges of studies with very short-lived postaccelerated radioactive beams.
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Affiliation(s)
- C Sotty
- CSNSM, CNRS/IN2P3, Université Paris-Sud, UMR8609, F-91405 ORSAY-Campus, France
- KU Leuven, Instituut voor Kern- en Stralingsfysica, 3001 Leuven, Belgium
| | - M Zielińska
- Heavy Ion Laboratory, University of Warsaw, 02-093 Warsaw, Poland
- IRFU/SPhN, CEA Saclay, F-91191 Gif-sur-Yvette, France
| | - G Georgiev
- CSNSM, CNRS/IN2P3, Université Paris-Sud, UMR8609, F-91405 ORSAY-Campus, France
| | - D L Balabanski
- ELI-NP, IFIN-HH, 30 Reactorului Street, 077125 Bucharest, Mǎgurele, Romania
| | - A E Stuchbery
- Department of Nuclear Physics, RSPE, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - A Blazhev
- Institute for Nuclear Physics, University of Cologne, Zülpicher Straße 77, D-50937 Cologne, Germany
| | - N Bree
- KU Leuven, Instituut voor Kern- en Stralingsfysica, 3001 Leuven, Belgium
| | - R Chevrier
- CEA, DAM, DIF, F-91297 Arpajon cedex, France
| | - S Das Gupta
- Dipartimento di Fisica, Universitá di Camerino, I-62032 Camerino, Italy and Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia, Italy
| | - J M Daugas
- CEA, DAM, DIF, F-91297 Arpajon cedex, France
| | - T Davinson
- Department of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
| | - H De Witte
- KU Leuven, Instituut voor Kern- en Stralingsfysica, 3001 Leuven, Belgium
| | - J Diriken
- KU Leuven, Instituut voor Kern- en Stralingsfysica, 3001 Leuven, Belgium
- Belgian Nuclear Research Centre SCK·CEN, Boeretang 200, B-2400 Mol, Belgium
| | - L P Gaffney
- KU Leuven, Instituut voor Kern- en Stralingsfysica, 3001 Leuven, Belgium
- Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - K Geibel
- Institute for Nuclear Physics, University of Cologne, Zülpicher Straße 77, D-50937 Cologne, Germany
| | - K Hadyńska-Klȩk
- Heavy Ion Laboratory, University of Warsaw, 02-093 Warsaw, Poland
| | - F G Kondev
- Nuclear Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - J Konki
- ISOLDE, CERN, CH-1211 Geneva 23, Switzerland
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 University of Jyväskylä, Finland
- Helsinki Institute of Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland
| | - T Kröll
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
| | - P Morel
- CEA, DAM, DIF, F-91297 Arpajon cedex, France
| | - P Napiorkowski
- Heavy Ion Laboratory, University of Warsaw, 02-093 Warsaw, Poland
| | - J Pakarinen
- ISOLDE, CERN, CH-1211 Geneva 23, Switzerland
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 University of Jyväskylä, Finland
- Helsinki Institute of Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland
| | - P Reiter
- Institute for Nuclear Physics, University of Cologne, Zülpicher Straße 77, D-50937 Cologne, Germany
| | - M Scheck
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
| | - M Seidlitz
- Institute for Nuclear Physics, University of Cologne, Zülpicher Straße 77, D-50937 Cologne, Germany
| | - B Siebeck
- Institute for Nuclear Physics, University of Cologne, Zülpicher Straße 77, D-50937 Cologne, Germany
| | - G Simpson
- LPSC, CNRS/IN2P3, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, INPG, F-38026 Grenoble Cedex, France
| | - H Törnqvist
- ISOLDE, CERN, CH-1211 Geneva 23, Switzerland
| | - N Warr
- Institute for Nuclear Physics, University of Cologne, Zülpicher Straße 77, D-50937 Cologne, Germany
| | - F Wenander
- ISOLDE, CERN, CH-1211 Geneva 23, Switzerland
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Régis JM, Jolie J, Mach H, Simpson G, Blazhev A, Pascovici G, Pfeiffer M, Rudigier M, Saed-Samii N, Warr N, Blanc A, de France G, Jentschel M, Köster U, Mutti P, Soldner T, Ur C, Urban W, Bruce A, Drouet F, Fraile L, Ilieva S, Korten W, Kröll T, Lalkovski S, Mărginean S, Paziy V, Podolyák Z, Regan P, Stezowski O, Vancraeyenest A. The Generalized Centroid Difference method for lifetime measurements via γ-γcoincidences using large fast-timing arrays. EPJ Web of Conferences 2015. [DOI: 10.1051/epjconf/20159301013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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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14
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Simpson GS, Gey G, Jungclaus A, Taprogge J, Nishimura S, Sieja K, Doornenbal P, Lorusso G, Söderström PA, Sumikama T, Xu ZY, Baba H, Browne F, Fukuda N, Inabe N, Isobe T, Jung HS, Kameda D, Kim GD, Kim YK, Kojouharov I, Kubo T, Kurz N, Kwon YK, Li Z, Sakurai H, Schaffner H, Shimizu Y, Suzuki H, Takeda H, Vajta Z, Watanabe H, Wu J, Yagi A, Yoshinaga K, Bönig S, Daugas JM, Drouet F, Gernhäuser R, Ilieva S, Kröll T, Montaner-Pizá A, Moschner K, Mücher D, Naïdja H, Nishibata H, Nowacki F, Odahara A, Orlandi R, Steiger K, Wendt A. Yrast 6⁺ seniority isomers of (136,138)Sn. Phys Rev Lett 2014; 113:132502. [PMID: 25302883 DOI: 10.1103/physrevlett.113.132502] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2014] [Indexed: 06/04/2023]
Abstract
Delayed γ-ray cascades, originating from the decay of (6⁺) isomeric states, in the very neutron-rich, semimagic isotopes (136,138)Sn have been observed following the projectile fission of a ²³⁸U beam at RIBF, RIKEN. The wave functions of these isomeric states are proposed to be predominantly a fully aligned pair of f(7/2) neutrons. Shell-model calculations, performed using a realistic effective interaction, reproduce well the energies of the excited states of these nuclei and the measured transition rates, with the exception of the B(E2;6⁺→4⁺) rate of ¹³⁶Sn, which deviates from a simple seniority scheme. Empirically reducing the νf(7/2)(2) orbit matrix elements produces a 4₁⁺ state with almost equal seniority 2 and 4 components, correctly reproducing the experimental B(E2;6⁺→4⁺) rate of ¹³⁶Sn. These data provide a key benchmark for shell-model interactions far from stability.
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Affiliation(s)
- G S Simpson
- School of Engineering, University of the West of Scotland, Paisley PA1 2BE, United Kingdom and Scottish Universities Physics Alliance, University of Glasgow, Glasgow G12 8QQ, United Kingdom and LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France
| | - G Gey
- LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France and Institut Laue-Langevin, B.P. 156, F-38042 Grenoble Cedex 9, France and RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - A Jungclaus
- Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
| | - J Taprogge
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan and Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain and Departamento de Física Teórica, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - S Nishimura
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - K Sieja
- Université de Strasbourg, IPHC, 23 Rue du Loess 67037 Strasbourg, France CNRS, UMR7178, 67037 Strasbourg, France
| | - P Doornenbal
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - G Lorusso
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - P-A Söderström
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - T Sumikama
- Department of Physics, Tohoku University, Aoba, Sendai, Miyagi 980-8578, Japan
| | - Z Y Xu
- Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, 113-0033 Tokyo, Japan
| | - H Baba
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - F Browne
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan and School of Computing, Engineering and Mathematics, University of Brighton, Brighton BN2 4JG, United Kingdom
| | - N Fukuda
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - N Inabe
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - T Isobe
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - H S Jung
- Department of Physics, Chung-Ang University, Seoul 156-756, Republic of Korea
| | - D Kameda
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - G D Kim
- Rare Isotope Science Project, Institute for Basic Science, Daejeon 305-811, Republic of Korea
| | - Y-K Kim
- Rare Isotope Science Project, Institute for Basic Science, Daejeon 305-811, Republic of Korea and Department of Nuclear Engineering, Hanyang University, Seoul 133-791, Republic of Korea
| | - I Kojouharov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - T Kubo
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - N Kurz
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - Y K Kwon
- Rare Isotope Science Project, Institute for Basic Science, Daejeon 305-811, Republic of Korea
| | - Z Li
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - H Sakurai
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan and Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, 113-0033 Tokyo, Japan
| | - H Schaffner
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - Y Shimizu
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - H Suzuki
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - H Takeda
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - Z Vajta
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan and MTA Atomki, P.O. Box 51, Debrecen H-4001, Hungary
| | - H Watanabe
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - J Wu
- RIKEN Nishina Center, RIKEN, 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
| | - A Yagi
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043, Toyonaka, Japan
| | - K Yoshinaga
- Department of Physics, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, Japan
| | - S Bönig
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
| | - J-M Daugas
- CEA, DAM, DIF, 91297 Arpajon Cedex, France
| | - F Drouet
- LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France
| | - R Gernhäuser
- Physik Department E12, Technische Universität München, D-85748 Garching, Germany
| | - S Ilieva
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
| | - T Kröll
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
| | - A Montaner-Pizá
- Instituto de Fíisica Corpuscular, CSIC-University of Valencia, E-46980 Paterna, Spain
| | - K Moschner
- IKP, University of Cologne, D-50937 Cologne, Germany
| | - D Mücher
- Physik Department E12, Technische Universität München, D-85748 Garching, Germany
| | - H Naïdja
- Université de Strasbourg, IPHC, 23 Rue du Loess 67037 Strasbourg, France CNRS, UMR7178, 67037 Strasbourg, France and GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany and Laboratoire de Physique Mathématique et Subatomique, Constantine 1 University, Constantine 25000, Algeria
| | - H Nishibata
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043, Toyonaka, Japan
| | - F Nowacki
- Université de Strasbourg, IPHC, 23 Rue du Loess 67037 Strasbourg, France CNRS, UMR7178, 67037 Strasbourg, France
| | - A Odahara
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043, Toyonaka, Japan
| | - R Orlandi
- Instituut voor Kern, en StralingsFysica, K.U. Leuven, B-3001 Heverlee, Belgium
| | - K Steiger
- Physik Department E12, Technische Universität München, D-85748 Garching, Germany
| | - A Wendt
- IKP, University of Cologne, D-50937 Cologne, Germany
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15
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Taprogge J, Jungclaus A, Grawe H, Nishimura S, Doornenbal P, Lorusso G, Simpson GS, Söderström PA, Sumikama T, Xu ZY, Baba H, Browne F, Fukuda N, Gernhäuser R, Gey G, Inabe N, Isobe T, Jung HS, Kameda D, Kim GD, Kim YK, Kojouharov I, Kubo T, Kurz N, Kwon YK, Li Z, Sakurai H, Schaffner H, Steiger K, Suzuki H, Takeda H, Vajta Z, Watanabe H, Wu J, Yagi A, Yoshinaga K, Benzoni G, Bönig S, Chae KY, Coraggio L, Covello A, Daugas JM, Drouet F, Gadea A, Gargano A, Ilieva S, Kondev FG, Kröll T, Lane GJ, Montaner-Pizá A, Moschner K, Mücher D, Naqvi F, Niikura M, Nishibata H, Odahara A, Orlandi R, Patel Z, Podolyák Z, Wendt A. 1p3/2 proton-hole state in 132Sn and the shell structure along N = 82. Phys Rev Lett 2014; 112:132501. [PMID: 24745408 DOI: 10.1103/physrevlett.112.132501] [Citation(s) in RCA: 1] [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] [Received: 01/31/2014] [Indexed: 06/03/2023]
Abstract
A low-lying state in 131In82, the one-proton hole nucleus with respect to double magic 132Sn, was observed by its γ decay to the Iπ=1/2- β-emitting isomer. We identify the new state at an excitation energy of Ex=1353 keV, which was populated both in the β decay of 131Cd83 and after β-delayed neutron emission from 132Cd84, as the previously unknown πp3/2 single-hole state with respect to the 132Sn core. Exploiting this crucial new experimental information, shell-model calculations were performed to study the structure of experimentally inaccessible N=82 isotones below 132Sn. The results evidence a surprising absence of proton subshell closures along the chain of N=82 isotones. The consequences of this finding for the evolution of the N=82 shell gap along the r-process path are discussed.
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Affiliation(s)
- 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 and RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - A Jungclaus
- Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
| | - H Grawe
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - S Nishimura
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - P Doornenbal
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - G Lorusso
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - G S Simpson
- LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France
| | - P-A Söderström
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - T Sumikama
- Department of Physics, Tohoku University, Aoba, Sendai, Miyagi 980-8578, Japan
| | - Z Y Xu
- Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, 113-0033 Tokyo, Japan
| | - H Baba
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - F Browne
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan and School of Computing, Engineering and Mathematics, University of Brighton, Brighton BN2 4JG, United Kingdom
| | - N Fukuda
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - R Gernhäuser
- Physik Department E12, Technische Universität München, D-85748 Garching, Germany
| | - G Gey
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan and LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France and Institut Laue-Langevin, B.P. 156, F-38042 Grenoble Cedex 9, France
| | - N Inabe
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - T Isobe
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - H S Jung
- Department of Physics, Chung-Ang University, Seoul 156-756, Republic of Korea
| | - D Kameda
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - G D Kim
- Rare Isotope Science Project, Institute for Basic Science, Daejeon 305-811, Republic of Korea
| | - Y-K Kim
- Rare Isotope Science Project, Institute for Basic Science, Daejeon 305-811, Republic of Korea and Department of Nuclear Engineering, Hanyang University, Seoul 133-791, Republic of Korea
| | - I Kojouharov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - T Kubo
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - N Kurz
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - Y K Kwon
- Rare Isotope Science Project, Institute for Basic Science, Daejeon 305-811, Republic of Korea
| | - Z Li
- School of Physics and State key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - H Sakurai
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan and Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, 113-0033 Tokyo, Japan
| | - H Schaffner
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - K Steiger
- Physik Department E12, Technische Universität München, D-85748 Garching, Germany
| | - H Suzuki
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - H Takeda
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - Zs Vajta
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan and MTA Atomki, P.O. Box 51, Debrecen H-4001, Hungary
| | - H Watanabe
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - J Wu
- RIKEN Nishina Center, RIKEN, 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
| | - A Yagi
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
| | - K Yoshinaga
- Department of Physics, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, Japan
| | - G Benzoni
- INFN, Sezione di Milano, via Celoria 16, I-20133 Milano, Italy
| | - S Bönig
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
| | - K Y Chae
- Department of Physics, Sungkyunkwan University, Suwon 440-746, Republic of Korea
| | - L Coraggio
- Istituto Nazionale di Fisica Nucleare, Complesso Universitario di Monte S. Angelo, I-80126 Napoli, Italy
| | - A Covello
- Istituto Nazionale di Fisica Nucleare, Complesso Universitario di Monte S. Angelo, I-80126 Napoli, Italy and Dipartimento di Fisica, Università di Napoli Federico II, Complesso Universitario di Monte S. Angelo, I-80126 Napoli, Italy
| | - J-M Daugas
- CEA, DAM, DIF, 91297 Arpajon cedex, France
| | - F Drouet
- LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France
| | - A Gadea
- Instituto de Fsica Corpuscular, CSIC-University of Valencia, E-46980 Paterna, Spain
| | - A Gargano
- Istituto Nazionale di Fisica Nucleare, Complesso Universitario di Monte S. Angelo, I-80126 Napoli, Italy
| | - S Ilieva
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
| | - F G Kondev
- Nuclear Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - T Kröll
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
| | - G J Lane
- Department of Nuclear Physics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, Australian Capital Territory 0200, Australia
| | - A Montaner-Pizá
- Instituto de Fsica Corpuscular, CSIC-University of Valencia, E-46980 Paterna, Spain
| | - K Moschner
- IKP, University of Cologne, D-50937 Cologne, Germany
| | - D Mücher
- Physik Department E12, Technische Universität München, D-85748 Garching, Germany
| | - F Naqvi
- Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520-8120, USA
| | - M Niikura
- Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, 113-0033 Tokyo, Japan
| | - H Nishibata
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
| | - A Odahara
- Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan
| | - R Orlandi
- Instituut voor Kern- en StralingsFysica, K.U. Leuven, B-3001 Heverlee, Belgium and Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan
| | - Z Patel
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - Zs Podolyák
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - A Wendt
- IKP, University of Cologne, D-50937 Cologne, Germany
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Schmid MV, Bagchi S, Bönig S, Csatlós M, Dillmann I, Dimopoulou C, Egelhof P, Eremin V, Furuno T, Geissel H, Gernhäuser R, Harakeh MN, Hartig AL, Ilieva S, Kalantar-Nayestanaki N, Kiselev O, Kollmus H, Kozhuharov C, Krasznahorkay A, Kröll T, Kuilman M, Litvinov S, Litvinov YA, Mahjour-Shafiei M, Mutterer M, Nagae D, Najafi MA, Nociforo C, Nolden F, Popp U, Rigollet C, Roy S, Scheidenberger C, Steck M, Streicher B, Stuhl L, Thürauf M, Uesaka T, Weick H, Winfield JS, Winters D, Woods PJ, Yamaguchi T, Yue K, Zamora JC, Zenihiro J. First EXL experiment with stored radioactive beam: Proton scattering on56Ni. EPJ Web of Conferences 2014. [DOI: 10.1051/epjconf/20146603093] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Jungclaus A, Simpson G, Gey G, Taprogge J, Nishimura S, Doornenbal P, Lorusso G, Söderström PA, Sumikama T, Xu Z, Baba H, Browne F, Fukuda N, Inabe N, Isobe T, Jung H, Kameda D, Kim G, Kim YK, Kojouharov I, Kubo T, Kurz N, Kwon Y, Li Z, Sakurai H, Schaffner H, Suzuki H, Takeda H, Vajta Z, Watanabe H, Wu J, Yagi A, Yoshinaga K, Bönig S, Daugas JM, Drouet F, Gernhäuser R, Ilieva S, Kröll T, Montaner-Pizá A, Moschner K, Mücher D, Nishibata H, Orlandi R, Steiger K, Wendt A. Isomer and beta decay spectroscopy in the 132Sn region with EURICA. EPJ Web of Conferences 2014. [DOI: 10.1051/epjconf/20146602040] [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: 11/14/2022] Open
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Bönig S, Ilieva S, Kröll T, Scheck M, Balabanski D, Bauer C, Blazhev A, Bloch T, Deleanu D, Diriken J, Fernier P, Gernhäuser R, Hadyńska-Kęk K, Jungclaus A, Lutter R, Negret A, Nowak K, Orlandi R, Pakarinen J, Rainovski G, Rodríguez T, Schmid MV, Seidlitz M, Siebeck B, Simpson G, Sisón AI, Stegmann R, Stora T, Thirolf P, Thürauf M, Vermeulen M, Voulot D, Warr N, Wenander F, Witte HD. Quadrupole collectivity in neutron-rich Cd isotopes. EPJ Web of Conferences 2014. [DOI: 10.1051/epjconf/20146602012] [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: 11/15/2022] Open
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Albers M, Warr N, Nomura K, Blazhev A, Jolie J, Mücher D, Bastin B, Bauer C, Bernards C, Bettermann L, Bildstein V, Butterworth J, Cappellazzo M, Cederkäll J, Cline D, Darby I, Das Gupta S, Daugas JM, Davinson T, De Witte H, Diriken J, Filipescu D, Fiori E, Fransen C, Gaffney LP, Georgiev G, Gernhäuser R, Hackstein M, Heinze S, Hess H, Huyse M, Jenkins D, Konki J, Kowalczyk M, Kröll T, Krücken R, Litzinger J, Lutter R, Marginean N, Mihai C, Moschner K, Napiorkowski P, Singh BSN, Nowak K, Otsuka T, Pakarinen J, Pfeiffer M, Radeck D, Reiter P, Rigby S, Robledo LM, Rodríguez-Guzmán R, Rudigier M, Sarriguren P, Scheck M, Seidlitz M, Siebeck B, Simpson G, Thöle P, Thomas T, Van de Walle J, Van Duppen P, Vermeulen M, Voulot D, Wadsworth R, Wenander F, Wimmer K, Zell KO, Zielinska M. Evidence for a smooth onset of deformation in the neutron-rich Kr isotopes. Phys Rev Lett 2012; 108:062701. [PMID: 22401060 DOI: 10.1103/physrevlett.108.062701] [Citation(s) in RCA: 5] [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] [Received: 11/10/2011] [Indexed: 05/31/2023]
Abstract
The neutron-rich nuclei 94,96Kr were studied via projectile Coulomb excitation at the REX-ISOLDE facility at CERN. Level energies of the first excited 2(+) states and their absolute E2 transition strengths to the ground state are determined and discussed in the context of the E(2(1)(+)) and B(E2;2(1)(+)→0(1)(+)) systematics of the krypton chain. Contrary to previously published results no sudden onset of deformation is observed. This experimental result is supported by a new proton-neutron interacting boson model calculation based on the constrained Hartree-Fock-Bogoliubov approach using the microscopic Gogny-D1M energy density functional.
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Affiliation(s)
- M Albers
- Institut für Kernphysik, Universität zu Köln, Köln, Germany.
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20
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Wimmer K, Kröll T, Krücken R, Bildstein V, Gernhäuser R, Bastin B, Bree N, Diriken J, Van Duppen P, Huyse M, Patronis N, Vermaelen P, Voulot D, Van de Walle J, Wenander F, Fraile LM, Chapman R, Hadinia B, Orlandi R, Smith JF, Lutter R, Thirolf PG, Labiche M, Blazhev A, Kalkühler M, Reiter P, Seidlitz M, Warr N, Macchiavelli AO, Jeppesen HB, Fiori E, Georgiev G, Schrieder G, Das Gupta S, Lo Bianco G, Nardelli S, Butterworth J, Johansen J, Riisager K. Discovery of the shape coexisting 0+ state in 32 Mg by a two neutron transfer reaction. Phys Rev Lett 2010; 105:252501. [PMID: 21231582 DOI: 10.1103/physrevlett.105.252501] [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] [Received: 08/05/2010] [Indexed: 05/30/2023]
Abstract
The "island of inversion" nucleus 32 Mg has been studied by a (t, p) two neutron transfer reaction in inverse kinematics at REX-ISOLDE. The shape coexistent excited 0+ state in 32 Mg has been identified by the characteristic angular distribution of the protons of the Δ L=0 transfer. The excitation energy of 1058 keV is much lower than predicted by any theoretical model. The low γ-ray intensity observed for the decay of this 0+ state indicates a lifetime of more than 10 ns. Deduced spectroscopic amplitudes are compared with occupation numbers from shell-model calculations.
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Affiliation(s)
- K Wimmer
- Physik Department E12, Technische Universität München, 85748 Garching, Germany
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21
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Schwerdtfeger W, Thirolf PG, Wimmer K, Habs D, Mach H, Rodriguez TR, Bildstein V, Egido JL, Fraile LM, Gernhäuser R, Hertenberger R, Heyde K, Hoff P, Hübel H, Köster U, Kröll T, Krücken R, Lutter R, Morgan T, Ring P. Shape coexistence near neutron number N=20: first identification of the E0 decay from the deformed first excited Jpi=0+ state in 30Mg. Phys Rev Lett 2009; 103:012501. [PMID: 19659139 DOI: 10.1103/physrevlett.103.012501] [Citation(s) in RCA: 1] [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] [Received: 08/02/2008] [Revised: 02/20/2009] [Indexed: 05/28/2023]
Abstract
The 1789 keV state in 30Mg was identified as the first excited 0+ state via its electric monopole (E0) transition to the ground state. The measured small value of rho2(E0,0(2)+-->0(1)+)=(26.2+/-7.5)x10(-3) implies within a two-level model a small mixing of competing configurations with largely different intrinsic quadrupole deformation near the neutron shell closure at N=20. Axially symmetric configuration mixing calculations identify the ground state of 30Mg to be based on neutron configurations below the N=20 shell closure, while the excited 0+ state mainly consists of two neutrons excited into the nu 1f7/2 orbital. The experimental result represents the first case where an E0 back decay from a strongly deformed second to the normal deformed first nuclear potential minimum well has been unambiguously identified, thus directly proving shape coexistence at the borderline of the much-debated "island of inversion."
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Affiliation(s)
- W Schwerdtfeger
- Ludwig-Maximilians-Universität München, D-85748 Garching, Germany
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22
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Van de Walle J, Aksouh F, Ames F, Behrens T, Bildstein V, Blazhev A, Cederkäll J, Clément E, Cocolios TE, Davinson T, Delahaye P, Eberth J, Ekström A, Fedorov DV, Fedosseev VN, Fraile LM, Franchoo S, Gernhauser R, Georgiev G, Habs D, Heyde K, Huber G, Huyse M, Ibrahim F, Ivanov O, Iwanicki J, Jolie J, Kester O, Köster U, Kröll T, Krücken R, Lauer M, Lisetskiy AF, Lutter R, Marsh BA, Mayet P, Niedermaier O, Nilsson T, Pantea M, Perru O, Raabe R, Reiter P, Sawicka M, Scheit H, Schrieder G, Schwalm D, Seliverstov MD, Sieber T, Sletten G, Smirnova N, Stanoiu M, Stefanescu I, Thomas JC, Valiente-Dobón JJ, Van Duppen P, Verney D, Voulot D, Warr N, Weisshaar D, Wenander F, Wolf BH, Zielińska M. Coulomb excitation of neutron-rich Zn isotopes: first observation of the 2(1)+ state in 80Zn. Phys Rev Lett 2007; 99:142501. [PMID: 17930664 DOI: 10.1103/physrevlett.99.142501] [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] [Received: 06/25/2007] [Indexed: 05/25/2023]
Abstract
Neutron-rich, radioactive Zn isotopes were investigated at the Radioactive Ion Beam facility REX-ISOLDE (CERN) using low-energy Coulomb excitation. The energy of the 2(1)+ state in 78Zn could be firmly established and for the first time the 2+ --> 0(1)+ transition in 80Zn was observed at 1492(1) keV. B(E2,2(1)+ --> 0(1)+) values were extracted for (74,76,78,80)Zn and compared to large scale shell model calculations. With only two protons outside the Z=28 proton core, 80Zn is the lightest N=50 isotone for which spectroscopic information has been obtained to date. Two sets of advanced shell model calculations reproduce the observed B(E2) systematics. The results for N=50 isotones indicate a good N=50 shell closure and a strong Z=28 proton core polarization. The new results serve as benchmarks to establish theoretical models, predicting the nuclear properties of the doubly magic nucleus 78Ni.
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Affiliation(s)
- J Van de Walle
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Leuven, Belgium
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23
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Hurst AM, Butler PA, Jenkins DG, Delahaye P, Wenander F, Ames F, Barton CJ, Behrens T, Bürger A, Cederkäll J, Clément E, Czosnyka T, Davinson T, de Angelis G, Eberth J, Ekström A, Franchoo S, Georgiev G, Görgen A, Herzberg RD, Huyse M, Ivanov O, Iwanicki J, Jones GD, Kent P, Köster U, Kröll T, Krücken R, Larsen AC, Nespolo M, Pantea M, Paul ES, Petri M, Scheit H, Sieber T, Siem S, Smith JF, Steer A, Stefanescu I, Syed NUH, Van de Walle J, Van Duppen P, Wadsworth R, Warr N, Weisshaar D, Zielińska M. Measurement of the sign of the spectroscopic quadrupole moment for the 2(1)+ state in 70Se: no evidence for oblate shape. Phys Rev Lett 2007; 98:072501. [PMID: 17359019 DOI: 10.1103/physrevlett.98.072501] [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] [Received: 08/17/2006] [Indexed: 05/14/2023]
Abstract
Using a method whereby molecular and atomic ions are independently selected, an isobarically pure beam of 70Se ions was postaccelerated to an energy of 206 MeV using REX-ISOLDE. Coulomb-excitation yields for states in the beam and target nuclei were deduced by recording deexcitation gamma rays in the highly segmented MINIBALL gamma-ray spectrometer in coincidence with scattered particles in a silicon detector. At these energies, the Coulomb-excitation yield for the first 2+ state is expected to be strongly sensitive to the sign of the spectroscopic quadrupole moment through the nuclear reorientation effect. Experimental evidence is presented here for a prolate shape for the first 2+ state in 70Se, reopening the question over whether there are, as reported earlier, deformed oblate shapes near to the ground state in the light selenium isotopes.
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Affiliation(s)
- A M Hurst
- Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
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24
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Grahn T, Dewald A, Möller O, Julin R, Beausang CW, Christen S, Darby IG, Eeckhaudt S, Greenlees PT, Görgen A, Helariutta K, Jolie J, Jones P, Juutinen S, Kettunen H, Kröll T, Krücken R, Le Coz Y, Leino M, Leppänen AP, Maierbeck P, Meyer DA, Melon B, Nieminen P, Nyman M, Page RD, Pakarinen J, Petkov P, Rahkila P, Saha B, Sandzelius M, Sarén J, Scholey C, Uusitalo J. Collectivity and configuration mixing in 186,188Pb and 194Po. Phys Rev Lett 2006; 97:062501. [PMID: 17026165 DOI: 10.1103/physrevlett.97.062501] [Citation(s) in RCA: 1] [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] [Received: 03/28/2006] [Indexed: 05/12/2023]
Abstract
Lifetimes of prolate intruder states in 186Pb and oblate intruder states in 194Po have been determined by employing, for the first time, the recoil-decay tagging technique in recoil distance Doppler-shift lifetime measurements. In addition, lifetime measurements of prolate states in 188Pb up to the 8+ state were carried out using the recoil-gating method. The B(E2) values have been deduced from which deformation parameters |beta2|=0.29(5) and |beta2|=0.17(3) for the prolate and the oblate bands, respectively, have been extracted. The results also shed new light on the mixing between different shapes.
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Affiliation(s)
- T Grahn
- Department of Physics, University of Jyväskylä, P. O. Box 35, FI-40014 Jyväskylä, Finland
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25
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Wilson AN, Singh AK, Hübel H, Davidson PM, Görgen A, Rossbach D, Korichi A, Astier A, Azaiez F, Bazzacco D, Bourgeois C, Buforn N, Byrne AP, Dracoulis GD, Hannachi F, Hauschild K, Korten W, Kröll T, Lane GJ, Lopez-Martens A, Redon N, Reiter P, Rossi-Alvarez C, Schonwasser G, Stezowski O, Thirolf PG. Excitation energies of superdeformed States in 196Pb: towards a systematic study of the second well in Pb isotopes. Phys Rev Lett 2005; 95:182501. [PMID: 16383897 DOI: 10.1103/physrevlett.95.182501] [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: 05/06/2005] [Indexed: 05/05/2023]
Abstract
The excitation energy of the lowest-energy superdeformed band in 196Pb is established using the techniques of time-correlated gamma-ray spectroscopy. Together with previous measurements on 192Pb and 194Pb, this result allows superdeformed excitation energies, binding energies, and two-proton and two-neutron separation energies to be studied systematically, providing stringent tests for current nuclear models. The results are examined for evidence of a "superdeformed shell gap."
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Affiliation(s)
- A N Wilson
- Department of Nuclear Physics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia.
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26
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Niedermaier O, Scheit H, Bildstein V, Boie H, Fitting J, von Hahn R, Köck F, Lauer M, Pal UK, Podlech H, Repnow R, Schwalm D, Alvarez C, Ames F, Bollen G, Emhofer S, Habs D, Kester O, Lutter R, Rudolph K, Pasini M, Thirolf PG, Wolf BH, Eberth J, Gersch G, Hess H, Reiter P, Thelen O, Warr N, Weisshaar D, Aksouh F, Van den Bergh P, Van Duppen P, Huyse M, Ivanov O, Mayet P, Van de Walle J, Aystö J, Butler PA, Cederkäll J, Delahaye P, Fynbo HOU, Fraile LM, Forstner O, Franchoo S, Köster U, Nilsson T, Oinonen M, Sieber T, Wenander F, Pantea M, Richter A, Schrieder G, Simon H, Behrens T, Gernhäuser R, Kröll T, Krücken R, Münch M, Davinson T, Gerl J, Huber G, Hurst A, Iwanicki J, Jonson B, Lieb P, Liljeby L, Schempp A, Scherillo A, Schmidt P, Walter G. "Safe" Coulomb excitation of 30Mg. Phys Rev Lett 2005; 94:172501. [PMID: 15904283 DOI: 10.1103/physrevlett.94.172501] [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: 12/17/2004] [Indexed: 05/02/2023]
Abstract
We report on the first radioactive beam experiment performed at the recently commissioned REX-ISOLDE facility at CERN in conjunction with the highly efficient gamma spectrometer MINIBALL. Using 30Mg ions accelerated to an energy of 2.25 MeV/u together with a thin (nat)Ni target, Coulomb excitation of the first excited 2+ states of the projectile and target nuclei well below the Coulomb barrier was observed. From the measured relative deexcitation gamma-ray yields the B(E2;0(+)gs-->2(+)1) value of 30Mg was determined to be 241(31)e2 fm4. Our result is lower than values obtained at projectile fragmentation facilities using the intermediate-energy Coulomb excitation method, and confirms the theoretical conjecture that the neutron-rich magnesium isotope 30Mg resides outside the "island of inversion."
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Affiliation(s)
- O Niedermaier
- Max-Planck-Insitut für Kernphysik, Heidelberg, Germany
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27
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Schmetzer H, Pelka-Fleischer R, Kröll T, Hiddemann W, Nüssler V. Dentritic cells in AML and MDS-comparison of different FCS-free culture conditions. Eur J Cancer 2001. [DOI: 10.1016/s0959-8049(01)80396-8] [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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28
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Xie H, Ender C, Gerl J, Härtlein T, Köck F, Kröll T, Reiter P, Schwalm D, Thirolf P, Vetter K, Wieswesser A, Wollersheim HJ. Coulomb excitation of the K pi =8(-) isomer in 178Hf. Phys Rev C Nucl Phys 1993; 48:2517-2519. [PMID: 9969110 DOI: 10.1103/physrevc.48.2517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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