1
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Kinoshita N, Paul M, Kashiv Y, Collon P, Deibel CM, DiGiovine B, Greene JP, Jiang CL, Marley ST, Pardo RC, Rehm KE, Robertson D, Scott R, Schmitt C, Tang XD, Vondrasek R, Yokoyama A. Retraction. Science 2023; 379:1307. [PMID: 36996231 DOI: 10.1126/science.adh7739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/01/2023]
Affiliation(s)
- N Kinoshita
- Shimizu Corporation Institute of Technology, Tokyo, Japan
| | - M Paul
- Hebrew University of Jerusalem, Jerusalem, Israel
| | - Y Kashiv
- University of Notre Dame, Notre Dame, IN, USA
| | - P Collon
- University of Notre Dame, Notre Dame, IN, USA
| | - C M Deibel
- Louisiana State University, Baton Rouge, LA, USA
| | - B DiGiovine
- Los Alamos National Laboratory, Los Alamos, NM, USA
| | - J P Greene
- Argonne National Laboratory, Argonne, IL, USA
| | - C L Jiang
- Argonne National Laboratory, Argonne, IL, USA
| | - S T Marley
- Louisiana State University, Baton Rouge, LA, USA
| | - R C Pardo
- Argonne National Laboratory, Argonne, IL, USA
| | - K E Rehm
- Argonne National Laboratory, Argonne, IL, USA
| | - D Robertson
- University of Notre Dame, Notre Dame, IN, USA
| | - R Scott
- Argonne National Laboratory, Argonne, IL, USA
| | - C Schmitt
- University of Notre Dame, Notre Dame, IN, USA
| | - X D Tang
- Institute of Modern Physics, Lanzhou, China
| | - R Vondrasek
- Argonne National Laboratory, Argonne, IL, USA
| | - A Yokoyama
- Kanazawa University, Kakumamachi, Kanazawa, Ishikawa, Japan
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2
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Almaraz-Calderon S, Rehm KE, Gerken N, Avila ML, Kay BP, Talwar R, Ayangeakaa AD, Bottoni S, Chen AA, Deibel CM, Dickerson C, Hanselman K, Hoffman CR, Jiang CL, Kuvin SA, Nusair O, Pardo RC, Santiago-Gonzalez D, Sethi J, Ugalde C. Study of the ^{26}Al^{m}(d,p)^{27}Al Reaction and the Influence of the ^{26}Al 0^{+} Isomer on the Destruction of ^{26}Al in the Galaxy. Phys Rev Lett 2017; 119:072701. [PMID: 28949677 DOI: 10.1103/physrevlett.119.072701] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Indexed: 06/07/2023]
Abstract
The existence of ^{26}Al (t_{1/2}=7.17×10^{5} yr) in the interstellar medium provides a direct confirmation of ongoing nucleosynthesis in the Galaxy. The presence of a low-lying 0^{+} isomer (^{26}Al^{m}), however, severely complicates the astrophysical calculations. We present for the first time a study of the ^{26}Al^{m}(d,p)^{27}Al reaction using an isomeric ^{26}Al beam. The selectivity of this reaction allowed the study of ℓ=0 transfers to T=1/2, and T=3/2 states in ^{27}Al. Mirror symmetry arguments were then used to constrain the ^{26}Al^{m}(p,γ)^{27}Si reaction rate and provide an experimentally determined upper limit of the rate for the destruction of isomeric ^{26}Al via radiative proton capture reactions, which is expected to dominate the destruction path of ^{26}Al^{m} in asymptotic giant branch stars, classical novae, and core collapse supernovae.
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Affiliation(s)
- S Almaraz-Calderon
- Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
| | - K E Rehm
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - N Gerken
- Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
| | - M L Avila
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - B P Kay
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - R Talwar
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - A D Ayangeakaa
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - S Bottoni
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - A A Chen
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - C M Deibel
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - C Dickerson
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - K Hanselman
- Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
| | - C R Hoffman
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - C L Jiang
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - S A Kuvin
- Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA
| | - O Nusair
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - R C Pardo
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - D Santiago-Gonzalez
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - J Sethi
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - C Ugalde
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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3
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Bucher B, Zhu S, Wu CY, Janssens RVF, Bernard RN, Robledo LM, Rodríguez TR, Cline D, Hayes AB, Ayangeakaa AD, Buckner MQ, Campbell CM, Carpenter MP, Clark JA, Crawford HL, David HM, Dickerson C, Harker J, Hoffman CR, Kay BP, Kondev FG, Lauritsen T, Macchiavelli AO, Pardo RC, Savard G, Seweryniak D, Vondrasek R. Direct Evidence for Octupole Deformation in ^{146}Ba and the Origin of Large E1 Moment Variations in Reflection-Asymmetric Nuclei. Phys Rev Lett 2017; 118:152504. [PMID: 28452498 DOI: 10.1103/physrevlett.118.152504] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Indexed: 06/07/2023]
Abstract
Despite the more than 1 order of magnitude difference between the measured dipole moments in ^{144}Ba and ^{146}Ba, the octupole correlations in ^{146}Ba are found to be as strong as those in ^{144}Ba with a similarly large value of B(E3;3^{-}→0^{+}) determined as 48(+21-29) W.u. The new results not only establish unambiguously the presence of a region of octupole deformation centered on these neutron-rich Ba isotopes, but also manifest the dependence of the electric dipole moments on the occupancy of different neutron orbitals in nuclei with enhanced octupole strength, as revealed by fully microscopic calculations.
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Affiliation(s)
- B Bucher
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
- Idaho National Laboratory, Idaho Falls, Idaho 83415, USA
| | - S Zhu
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - C Y Wu
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R V F Janssens
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - R N Bernard
- Departamento de Física Teórica, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - L M Robledo
- Departamento de Física Teórica, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - T R Rodríguez
- Departamento de Física Teórica, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - D Cline
- University of Rochester, Rochester, New York 14627, USA
| | - A B Hayes
- University of Rochester, Rochester, New York 14627, USA
| | - A D Ayangeakaa
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - M Q Buckner
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C M Campbell
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - M P Carpenter
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - J A Clark
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - H L Crawford
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - H M David
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - C Dickerson
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - J Harker
- Argonne National Laboratory, Argonne, Illinois 60439, USA
- University of Maryland, College Park, Maryland 20742, USA
| | - C R Hoffman
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - B P Kay
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - F G Kondev
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - T Lauritsen
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - A O Macchiavelli
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - R C Pardo
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - G Savard
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - D Seweryniak
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - R Vondrasek
- Argonne National Laboratory, Argonne, Illinois 60439, USA
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4
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Bucher B, Zhu S, Wu CY, Janssens RVF, Cline D, Hayes AB, Albers M, Ayangeakaa AD, Butler PA, Campbell CM, Carpenter MP, Chiara CJ, Clark JA, Crawford HL, Cromaz M, David HM, Dickerson C, Gregor ET, Harker J, Hoffman CR, Kay BP, Kondev FG, Korichi A, Lauritsen T, Macchiavelli AO, Pardo RC, Richard A, Riley MA, Savard G, Scheck M, Seweryniak D, Smith MK, Vondrasek R, Wiens A. Direct Evidence of Octupole Deformation in Neutron-Rich ^{144}Ba. Phys Rev Lett 2016; 116:112503. [PMID: 27035298 DOI: 10.1103/physrevlett.116.112503] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Indexed: 06/05/2023]
Abstract
The neutron-rich nucleus ^{144}Ba (t_{1/2}=11.5 s) is expected to exhibit some of the strongest octupole correlations among nuclei with mass numbers A less than 200. Until now, indirect evidence for such strong correlations has been inferred from observations such as enhanced E1 transitions and interleaving positive- and negative-parity levels in the ground-state band. In this experiment, the octupole strength was measured directly by sub-barrier, multistep Coulomb excitation of a post-accelerated 650-MeV ^{144}Ba beam on a 1.0-mg/cm^{2} ^{208}Pb target. The measured value of the matrix element, ⟨3_{1}^{-}∥M(E3)∥0_{1}^{+}⟩=0.65(+17/-23) eb^{3/2}, corresponds to a reduced B(E3) transition probability of 48(+25/-34) W.u. This result represents an unambiguous determination of the octupole collectivity, is larger than any available theoretical prediction, and is consistent with octupole deformation.
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Affiliation(s)
- B Bucher
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S Zhu
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - C Y Wu
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R V F Janssens
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - D Cline
- University of Rochester, Rochester, New York 14627, USA
| | - A B Hayes
- University of Rochester, Rochester, New York 14627, USA
| | - M Albers
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - A D Ayangeakaa
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - P A Butler
- University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - C M Campbell
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - M P Carpenter
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - C J Chiara
- Argonne National Laboratory, Argonne, Illinois 60439, USA
- University of Maryland, College Park, Maryland 20742, USA
| | - J A Clark
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | | | - M Cromaz
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - H M David
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - C Dickerson
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - E T Gregor
- University of the West of Scotland, Paisley PA1 2BE, United Kingdom
- SUPA, Scottish Universities Physics Alliance, Glasgow G12 8QQ, United Kingdom
| | - J Harker
- Argonne National Laboratory, Argonne, Illinois 60439, USA
- University of Maryland, College Park, Maryland 20742, USA
| | - C R Hoffman
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - B P Kay
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - F G Kondev
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - A Korichi
- Argonne National Laboratory, Argonne, Illinois 60439, USA
- CSNSM, IN2P3-CNRS, bâtiment 104-108, F-91405 Orsay Campus, France
| | - T Lauritsen
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - A O Macchiavelli
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - R C Pardo
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - A Richard
- Ohio University, Athens, Ohio 45701, USA
| | - M A Riley
- Florida State University, Tallahassee, Florida 32306, USA
| | - G Savard
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - M Scheck
- University of the West of Scotland, Paisley PA1 2BE, United Kingdom
- SUPA, Scottish Universities Physics Alliance, Glasgow G12 8QQ, United Kingdom
| | - D Seweryniak
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - M K Smith
- University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - R Vondrasek
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - A Wiens
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
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5
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Avila ML, Rehm KE, Almaraz-Calderon S, Carnelli PFF, DiGiovine B, Esbensen H, Hoffman CR, Jiang CL, Kay BP, Lai J, Nusair O, Pardo RC, Santiago-Gonzalez D, Talwar R, Ugalde C. Study of the 20,22Ne+ 20,22Ne and 10,12,13,14,15C+ 12C Fusion Reactions with MUSIC. EPJ Web of Conferences 2016. [DOI: 10.1051/epjconf/201611708009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [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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6
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Almaraz-Calderon S, Carnelli PFF, Rehm KE, Albers M, Alcorta M, Bertone PF, Digiovine B, Esbensen H, Fernandez Niello JO, Henderson D, Jiang CL, Lai J, Marley ST, Nusair O, Palchan-Hazan T, Pardo RC, Paul M, Ugalde C. C+C Fusion Cross Sections Measurements for Nuclear Astrophysics. EPJ Web of Conferences 2015. [DOI: 10.1051/epjconf/20159601001] [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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7
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Carnelli PFF, Almaraz-Calderon S, Rehm KE, Albers M, Alcorta M, Bertone PF, Digiovine B, Esbensen H, Niello JOF, Henderson D, Jiang CL, Lai J, Marley ST, Nusair O, Palchan-Hazan T, Pardo RC, Paul M, Ugalde C. Measurements of fusion reactions of low-intensity radioactive carbon beams on 12C and their implications for the understanding of X-ray bursts. Phys Rev Lett 2014; 112:192701. [PMID: 24877935 DOI: 10.1103/physrevlett.112.192701] [Citation(s) in RCA: 4] [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: 02/05/2014] [Indexed: 06/03/2023]
Abstract
The interaction between neutron-rich nuclei plays an important role for understanding the reaction mechanism of the fusion process as well as for the energy production through pycnonuclear reactions in the crust of neutron stars. We have performed the first measurements of the total fusion cross sections in the systems (10,14,15)C+(12)C using a new active target-detector system. In the energy region accessible with existing radioactive beams, a good agreement between the experimental and theoretical cross sections is observed. This gives confidence in our ability to calculate fusion cross sections for systems which are outside the range of today's radioactive beam facilities.
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Affiliation(s)
- P F F Carnelli
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA and Laboratorio Tandar, Comisión Nacional de Energía Atómica, B1650KNA San Martín, Buenos Aires, Argentina and Consejo Nacional de Investigaciones Científicas y Técnicas, C1033AAJ Buenos Aires, Argentina
| | - S Almaraz-Calderon
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - K E Rehm
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - M Albers
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - M Alcorta
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - P F Bertone
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - B Digiovine
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - H Esbensen
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - J O Fernández Niello
- Laboratorio Tandar, Comisión Nacional de Energía Atómica, B1650KNA San Martín, Buenos Aires, Argentina and Escuela de Ciencia y Tecnología, Universidad de San Martín, B1650BWA San Martín, Buenos Aires, Argentina
| | - D Henderson
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - C L Jiang
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - J Lai
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - S T Marley
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - O Nusair
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - T Palchan-Hazan
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - R C Pardo
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - M Paul
- Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel
| | - C Ugalde
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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8
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Wuosmaa AH, Bedoor S, Alcorta M, Back BB, Brown BA, Deibel CM, Hoffman CR, Lighthall JC, Marley ST, Pardo RC, Rehm KE, Rogers AM, Schiffer JP, Shetty DV. Evolution of Single-Particle Energies for N=9 Nuclei at Large N/Z. EPJ Web of Conferences 2014. [DOI: 10.1051/epjconf/20146603098] [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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9
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Kinoshita N, Paul M, Kashiv Y, Collon P, Deibel CM, DiGiovine B, Greene JP, Henderson DJ, Jiang CL, Marley ST, Nakanishi T, Pardo RC, Rehm KE, Robertson D, Scott R, Schmitt C, Tang XD, Vondrasek R, Yokoyama A. A Shorter
146
Sm Half-Life Measured and Implications for
146
Sm-
142
Nd Chronology in the Solar System. Science 2012; 335:1614-7. [PMID: 22461609 DOI: 10.1126/science.1215510] [Citation(s) in RCA: 139] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The extinct p-process nuclide (146)Sm serves as an astrophysical and geochemical chronometer through measurements of isotopic anomalies of its α-decay daughter (142)Nd. Based on analyses of (146)Sm/(147)Sm α-activity and atom ratios, we determined the half-life of (146)Sm to be 68 ± 7 (1σ) million years, which is shorter than the currently used value of 103 ± 5 million years. This half-life value implies a higher initial (146)Sm abundance in the early solar system, ((146)Sm/(144)Sm)(0) = 0.0094 ± 0.0005 (2σ), than previously estimated. Terrestrial, lunar, and martian planetary silicate mantle differentiation events dated with (146)Sm-(142)Nd converge to a shorter time span and in general to earlier times, due to the combined effect of the new (146)Sm half-life and ((146)Sm/(144)Sm)(0) values.
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Affiliation(s)
- N. Kinoshita
- Research Facility Center for Science and Technology, University of Tsukuba, Japan
| | - M. Paul
- Racah Institute of Physics, Hebrew University, Jerusalem, Israel 91904
| | - Y. Kashiv
- Department of Physics, University of Notre Dame, Notre Dame, IN 46556–5670, USA
| | - P. Collon
- Department of Physics, University of Notre Dame, Notre Dame, IN 46556–5670, USA
| | - C. M. Deibel
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, MI 46624, USA
| | - B. DiGiovine
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - J. P. Greene
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - D. J. Henderson
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - C. L. Jiang
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - S. T. Marley
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - T. Nakanishi
- Faculty of Chemistry, Institute of Science and Engineering, Kanazawa University, Japan
| | - R. C. Pardo
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - K. E. Rehm
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - D. Robertson
- Department of Physics, University of Notre Dame, Notre Dame, IN 46556–5670, USA
| | - R. Scott
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - C. Schmitt
- Department of Physics, University of Notre Dame, Notre Dame, IN 46556–5670, USA
| | - X. D. Tang
- Department of Physics, University of Notre Dame, Notre Dame, IN 46556–5670, USA
| | - R. Vondrasek
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - A. Yokoyama
- Faculty of Chemistry, Institute of Science and Engineering, Kanazawa University, Japan
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10
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Kondrashev S, Dickerson C, Levand A, Ostroumov PN, Pardo RC, Savard G, Vondrasek R, Alessi J, Beebe E, Pikin A, Kuznetsov GI, Batazova MA. Development of electron beam ion source charge breeder for rare isotopes at Californium Rare Isotope Breeder Upgrade. Rev Sci Instrum 2012; 83:02A902. [PMID: 22380243 DOI: 10.1063/1.3660823] [Citation(s) in RCA: 2] [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] [Indexed: 05/31/2023]
Abstract
Recently, the Californium Rare Isotope Breeder Upgrade (CARIBU) to the Argonne Tandem Linac Accelerator System (ATLAS) was commissioned and became available for production of rare isotopes. Currently, an electron cyclotron resonance ion source is used as a charge breeder for CARIBU beams. To further increase the intensity and improve the purity of neutron-rich ion beams accelerated by ATLAS, we are developing a high-efficiency charge breeder for CARIBU based on an electron beam ion source (EBIS). The CARIBU EBIS charge breeder will utilize the state-of-the-art EBIS technology recently developed at Brookhaven National Laboratory (BNL). The electron beam current density in the CARIBU EBIS trap will be significantly higher than that in existing operational charge-state breeders based on the EBIS concept. The design of the CARIBU EBIS charge breeder is nearly complete. Long-lead components of the EBIS such as a 6-T superconducting solenoid and an electron gun have been ordered with the delivery schedule in the fall of 2011. Measurements of expected breeding efficiency using the BNL Test EBIS have been performed using a Cs(+) surface ionization ion source for external injection in pulsed mode. In these experiments we have achieved ∼70% injection∕extraction efficiency and breeding efficiency into the most abundant charge state of ∼17%.
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Affiliation(s)
- S Kondrashev
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
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11
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Savard G, Pardo RC, Baker S, Davids CN, Levand A, Peterson D, Phillips DG, Sun T, Vondrasek R, Zabransky BJ, Zinkann GP. CARIBU: a new facility for the study of neutron-rich isotopes. ACTA ACUST UNITED AC 2011. [DOI: 10.1007/s10751-011-0325-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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12
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Alcorta M, Rehm KE, Back BB, Bedoor S, Bertone PF, Deibel CM, DiGiovine B, Esbensen H, Greene JP, Hoffman CR, Jiang CL, Lighthall JC, Marley ST, Pardo RC, Paul M, Rogers AM, Ugalde C, Wuosmaa AH. Fusion reactions with the one-neutron halo nucleus (15)C. Phys Rev Lett 2011; 106:172701. [PMID: 21635032 DOI: 10.1103/physrevlett.106.172701] [Citation(s) in RCA: 2] [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: 01/31/2011] [Indexed: 05/30/2023]
Abstract
The structure of (15)C, with an s(1/2) neutron weakly bound to a closed-neutron shell nucleus (14)C, makes it a prime candidate for a one-neutron halo nucleus. We have for the first time studied the cross section for the fusion-fission reaction (15)C+(232)Th at energies in the vicinity of the Coulomb barrier and compared it to the yield of the neighboring (14)C+(232)Th system measured in the same experiment. At sub-barrier energies, an enhancement of the fusion yield by factors of 2-5 was observed for (15)C, while the cross sections for (14)C match the trends measured for (12,13)C.
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Affiliation(s)
- M Alcorta
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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13
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Alcorta M, Rehm KE, Back BB, Bedoor S, Bertone PF, Deibel CM, DiGiovine B, Esbensen H, Greene JP, Hoffman CR, Jiang CL, Lighthall JC, Marley ST, Pardo RC, Paul M, Rogers AM, Ugalde C, Wuosmaa AH. Fusion reactions with the one-neutron halo nucleus 15C. EPJ Web of Conferences 2011. [DOI: 10.1051/epjconf/20111713003] [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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14
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Wuosmaa AH, Back BB, Baker S, Brown BA, Deibel CM, Fallon P, Hoffman CR, Kay BP, Lee HY, Lighthall JC, Macchiavelli AO, Marley ST, Pardo RC, Rehm KE, Schiffer JP, Shetty DV, Wiedeking M. ¹⁵C(d,p)¹⁶C reaction and exotic behavior in ¹⁶C. Phys Rev Lett 2010; 105:132501. [PMID: 21230766 DOI: 10.1103/physrevlett.105.132501] [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: 06/16/2010] [Indexed: 05/30/2023]
Abstract
We have studied the ¹⁵C(d,p)¹⁶C reaction in inverse kinematics using the Helical Orbit Spectrometer at Argonne National Laboratory. Prior studies of electromagnetic-transition rates in ¹⁶C suggested an exotic decoupling of the valence neutrons from the core in that nucleus. Neutron-adding spectroscopic factors give a different probe of the wave functions of the relevant states in ¹⁶C. Shell-model calculations reproduce both the present transfer data and the previously measured transition rates, suggesting that ¹⁶C may be described without invoking very exotic phenomena.
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Affiliation(s)
- A H Wuosmaa
- Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008-5252, USA
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15
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Back BB, Baker SI, Brown BA, Deibel CM, Freeman SJ, DiGiovine BJ, Hoffman CR, Kay BP, Lee HY, Lighthall JC, Marley ST, Pardo RC, Rehm KE, Schiffer JP, Shetty DV, Vann AW, Winkelbauer J, Wuosmaa AH. First experiment with HELIOS: the structure of 13B. Phys Rev Lett 2010; 104:132501. [PMID: 20481878 DOI: 10.1103/physrevlett.104.132501] [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: 02/01/2010] [Indexed: 05/29/2023]
Abstract
A first experiment is reported that makes use of a new kind of spectrometer uniquely suited to the study of reactions with radioactive beams in inverse kinematics, the helical orbit spectrometer, HELIOS. The properties of some low-lying states in the neutron-rich N=8 nucleus 13B were studied with good resolution. From the measured angular distributions of the (d,p) reaction and the relative spectroscopic factors, spin and configuration assignments of the first- and third-excited states of this nucleus can be constrained.
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Affiliation(s)
- B B Back
- Argonne National Laboratory, Argonne, Illinois 60439, USA
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16
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Kim JS, Zhao L, Cluggish BP, Galkin SA, Grubert JE, Pardo RC, Vondrasek RC. Integrated modeling of electron cyclotron resonance ion sources and charge breeders with GEM, MCBC, and IonEx. Rev Sci Instrum 2010; 81:02A905. [PMID: 20192403 DOI: 10.1063/1.3266147] [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] [Indexed: 05/28/2023]
Abstract
A numerical toolset to help in understanding physical processes in the electron cyclotron resonance charge breeder (ECRCB) and further to help optimization and design of current and future machines is presented. The toolset consists of three modules (Monte Carlo charge breeding code, generalized electron cyclotron resonance ion source modeling, and ion extraction), each modeling different processes occurring in the ECRCB from beam injection to extraction. The toolset provides qualitative study, such as parameter studies, and scaling of the operation, and physical understanding in the ECRCB. The methodology and a sample integrated modeling are presented.
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Affiliation(s)
- J S Kim
- FAR-TECH, Inc., 3550 General Atomics Court, MS 15-155, San Diego, California 92121, USA.
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17
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Vondrasek RC, Scott R, Carr J, Pardo RC. Status of the electron cyclotron resonance charge breeder for the (252)Cf fission source project at ATLAS. Rev Sci Instrum 2008; 79:02A901. [PMID: 18315156 DOI: 10.1063/1.2802580] [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] [Indexed: 05/26/2023]
Abstract
The construction of the Californium Rare Ion Breeder Upgrade, a new radioactive beam facility for the Argonne tandem linac accelerator system (ATLAS), is in progress. The facility will use fission fragments from a 1 Ci (252)Cf source, thermalized and collected into a low-energy particle beam by a helium gas catcher. In order to reaccelerate these beams, the existing ATLAS ECR1 ion source has been redesigned to function as a charge breeder source. The design features, initial results, and status of this charge breeder configuration are presented.
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Affiliation(s)
- R C Vondrasek
- Argonne National Laboratory, Physics Division, Argonne, IL 60439, USA.
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18
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Tang XD, Rehm KE, Ahmad I, Brune CR, Champagne A, Greene JP, Hecht AA, Henderson D, Janssens RVF, Jiang CL, Jisonna L, Kahl D, Moore EF, Notani M, Pardo RC, Patel N, Paul M, Savard G, Schiffer JP, Segel RE, Sinha S, Shumard B, Wuosmaa AH. New determination of the astrophysical S factor SE1 of the 12C(alpha,gamma)16O reaction. Phys Rev Lett 2007; 99:052502. [PMID: 17930748 DOI: 10.1103/physrevlett.99.052502] [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: 03/16/2007] [Indexed: 05/25/2023]
Abstract
A new measurement of the beta-delayed alpha decay of 16N has been performed using a set of high efficiency ionization chambers. Sources were made by implantation of a 16N beam, yielding very clean alpha spectra down to energies as low as 400 keV. Our data are in good agreement with earlier results. For the S factor S(E1), we obtain a value of 74 +/- 21 keV b. In spite of improvements in the measurement, the error in S(E1) remains relatively large because of the correlations among the fit parameters and the uncertainties inherent to the extrapolation.
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Affiliation(s)
- X D Tang
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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19
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Kinoshita N, Hashimoto T, Nakanishi T, Yokoyama A, Amakawa H, Mitsugashira T, Ohtsuki T, Takahashi N, Ahmad I, Greene JP, Henderson DJ, Jiang CL, Notani M, Pardo RC, Patel N, Rehm KE, Scott R, Vondrasek R, Jisonna L, Collon P, Robertson D, Schmitt C, Tang XD, Kashiv Y, Paul M. Technological Development for Half-life Measurement of 146Sm Nuclide. ACTA ACUST UNITED AC 2007. [DOI: 10.14494/jnrs2000.8.109] [Citation(s) in RCA: 3] [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: 11/18/2022]
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20
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Hayes AB, Cline D, Wu CY, Ai J, Amro H, Beausang C, Casten RF, Gerl J, Hecht AA, Heinz A, Hughes R, Janssens RVF, Lister CJ, Macchiavelli AO, Meyer DA, Moore EF, Napiorkowski P, Pardo RC, Schlegel C, Seweryniak D, Simon MW, Srebrny J, Teng R, Vetter K, Wollersheim HJ. Breakdown of K selection in 178Hf. Phys Rev Lett 2006; 96:042505. [PMID: 16486815 DOI: 10.1103/physrevlett.96.042505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2005] [Indexed: 05/06/2023]
Abstract
Coulomb activation of the four quasiparticle Kpi=16+ 178Hf isomer (t1/2=31 y) has led to the measurement of a set of Elamda matrix elements coupling the isomer band to the ground band. The present data combined with earlier 178 Hf Coulomb excitation data have probed the components in the wave functions and revealed the onset and saturation of K mixing in low-K bands, whereas the mixing is negligible in the high-K bands. The implications can be applied to other quadrupole-deformed nuclei.
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Affiliation(s)
- A B Hayes
- Nuclear Structure Research Laboratory, Department of Physics, University of Rochester, Rochester, New York 14627, USA
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21
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Nassar H, Paul M, Ahmad I, Ben-Dov Y, Caggiano J, Ghelberg S, Goriely S, Greene JP, Hass M, Heger A, Heinz A, Henderson DJ, Janssens RVF, Jiang CL, Kashiv Y, Nara Singh BS, Ofan A, Pardo RC, Pennington T, Rehm KE, Savard G, Scott R, Vondrasek R. 40Ca(alpha, gamma)44Ti reaction in the energy regime of supernova nucleosynthesis. Phys Rev Lett 2006; 96:041102. [PMID: 16486801 DOI: 10.1103/physrevlett.96.041102] [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: 08/31/2005] [Indexed: 05/06/2023]
Abstract
The 44Ti(t1/2=59 yr) nuclide, an important signature of supernova nucleosynthesis, has recently been observed as live radioactivity by gamma-ray astronomy from the Cas A remnant. We investigate in the laboratory the major 44Ti production reaction 40Ca(alpha, gamma)44Ti (Ec.m. approximately 0.6-1.2 MeV/u by direct off-line counting of 44Ti nuclei. The yield, significantly higher than inferred from previous experiments, is analyzed in terms of a statistical model using microscopic nuclear inputs. The associated stellar rate has important astrophysical consequences, increasing the calculated supernova 44Ti yield by a factor approximately 2 over previous estimates and bringing it closer to Cas A observations.
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Affiliation(s)
- H Nassar
- Racah Institute of Physics, Hebrew University, 91904 Jerusalem, Israel
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22
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Nassar H, Paul M, Ahmad I, Berkovits D, Bettan M, Collon P, Dababneh S, Ghelberg S, Greene JP, Heger A, Heil M, Henderson DJ, Jiang CL, Käppeler F, Koivisto H, O'Brien S, Pardo RC, Patronis N, Pennington T, Plag R, Rehm KE, Reifarth R, Scott R, Sinha S, Tang X, Vondrasek R. Stellar (n,gamma) cross section of 62Ni. Phys Rev Lett 2005; 94:092504. [PMID: 15783960 DOI: 10.1103/physrevlett.94.092504] [Citation(s) in RCA: 8] [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: 06/04/2004] [Revised: 12/15/2004] [Indexed: 05/24/2023]
Abstract
The 62Ni(n,gamma)63Ni(t(1/2)=100+/-2 yr) reaction plays an important role in the control of the flow path of the slow neutron-capture (s) nucleosynthesis process. We have measured for the first time the total cross section of this reaction for a quasi-Maxwellian (kT=25 keV) neutron flux. The measurement was performed by fast-neutron activation, combined with accelerator mass spectrometry to detect directly the 63Ni product nuclei. The experimental value of 28.4+/-2.8 mb, fairly consistent with a recent calculation, affects the calculated net yield of 62Ni itself and the whole distribution of nuclei with 62<A<90 produced by the weak s process in massive stars.
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Affiliation(s)
- H Nassar
- Racah Institute of Physics, Hebrew University, Jerusalem, Israel, 91904
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23
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Wuosmaa AH, Rehm KE, Greene JP, Henderson DJ, Janssens RVF, Jiang CL, Jisonna L, Moore EF, Pardo RC, Paul M, Peterson D, Pieper SC, Savard G, Schiffer JP, Segel RE, Sinha S, Tang X, Wiringa RB. Neutron spectroscopic factors in 9Li from 2H(8Li,p)9Li. Phys Rev Lett 2005; 94:082502. [PMID: 15783884 DOI: 10.1103/physrevlett.94.082502] [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: 09/17/2004] [Indexed: 05/24/2023]
Abstract
We have studied the 2H(8Li,p)9Li reaction to obtain information on the spins, parities, and single-neutron spectroscopic factors for states in 9Li, using a radioactive 8Li beam. The deduced properties of the lowest three states are compared to the predictions of a number of calculations for the structure of 9Li. The results of ab initio quantum Monte Carlo calculations are in good agreement with the observed properties.
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Affiliation(s)
- A H Wuosmaa
- Physics Department, Western Michigan University, Kalamazoo, MI 49008-5252, USA
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24
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Wang LB, Mueller P, Bailey K, Drake GWF, Greene JP, Henderson D, Holt RJ, Janssens RVF, Jiang CL, Lu ZT, O'Connor TP, Pardo RC, Rehm KE, Schiffer JP, Tang XD. Laser spectroscopic determination of the 6He nuclear charge radius. Phys Rev Lett 2004; 93:142501. [PMID: 15524784 DOI: 10.1103/physrevlett.93.142501] [Citation(s) in RCA: 9] [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: 06/14/2004] [Indexed: 05/24/2023]
Abstract
We have performed precision laser spectroscopy on individual 6He (t(1/2)=0.8 s) atoms confined and cooled in a magneto-optical trap, and measured the isotope shift between 6He and 4He to be 43 194.772+/-0.056 MHz for the 2(3)S1-3(3)P2 transition. Based on this measurement and atomic theory, the nuclear charge radius of 6He is determined for the first time in a method independent of nuclear models to be 2.054+/-0.014 fm. The result is compared with the values predicted by a number of nuclear structure calculations and tests their ability to characterize this loosely bound halo nucleus.
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Affiliation(s)
- L-B Wang
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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25
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Winter WT, Freedman SJ, Rehm KE, Ahmad I, Greene JP, Heinz A, Henderson D, Janssens RVF, Jiang CL, Moore EF, Mukherjee G, Pardo RC, Pennington T, Savard G, Schiffer JP, Seweryniak D, Zinkann G, Paul M. Determination of the 8B neutrino spectrum. Phys Rev Lett 2003; 91:252501. [PMID: 14754108 DOI: 10.1103/physrevlett.91.252501] [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: 03/19/2003] [Revised: 09/22/2003] [Indexed: 05/24/2023]
Abstract
We have measured the total energy of the alpha particles following the beta decay of 8B by implanting 8B into a planar silicon surface barrier detector. Calibration was performed using alpha particles following the beta decay of 20Na, similarly implanted. The alpha spectrum is used to infer the 8B neutrino spectrum which is an important input in the interpretation of experiments that detect energetic neutrinos from the Sun. The alpha spectrum reported here is in disagreement with the previous best measurement which used two detectors in coincidence.
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Affiliation(s)
- W T Winter
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
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26
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Rehm KE, Jiang CL, Ahmad I, Caggiano J, Collon P, Greene JP, Henderson D, Heinz A, Janssens RVF, Pardo RC, Pennington T, Schiffer JP, Siemssen RH, Wuosmaa AH, Paul M, Mohr P. Large angle elastic alpha scattering on a N=Z nucleus above A=40. Phys Rev Lett 2002; 89:132501. [PMID: 12225019 DOI: 10.1103/physrevlett.89.132501] [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: 05/06/2002] [Indexed: 05/23/2023]
Abstract
Scattering of alpha particles from 44Ti, the lightest unstable alpha-particle nucleus above A=40, has been measured at backward angles. The "anomalous" order-of-magnitude enhancement that is characteristic of 40Ca and other light alpha-particle nuclei is not observed. Instead, the backward yield is similar to that observed for other nuclei heavier than 40Ca, and is well described with average optical model parameters.
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Affiliation(s)
- K E Rehm
- Argonne National Laboratory, Argonne, Illinois 60439, USA
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27
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Ostroumov PN, Pardo RC, Zinkann GP, Shepard KW, Nolen JA. Simultaneous acceleration of multiply charged ions through a superconducting linac. Phys Rev Lett 2001; 86:2798-2801. [PMID: 11290042 DOI: 10.1103/physrevlett.86.2798] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2000] [Indexed: 05/23/2023]
Abstract
The possibility of simultaneously accelerating particles with a range of charge-to-mass ratios ( approximately 20%) to the same energy is proposed and demonstrated for a superconducting linac. Uranium ions stripped in a foil with eight charge states have been accelerated through a portion of the ATLAS linac from 286 to 690 MeV, with 94% of the injected uranium in the accelerated beam. Emittance of the resultant beam has been measured and the energy spread was 1.3% compared to 0.4% for a single charge state. This development has immediate application to the high-intensity acceleration of heavy ions that are limited by ion-source intensities, such as the proposed Rare Isotope Accelerator Facility.
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Affiliation(s)
- P N Ostroumov
- Physics Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, USA
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28
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Sonzogni AA, Rehm KE, Ahmad I, Borasi F, Bowers DL, Brumwell F, Caggiano J, Davids CN, Greene JP, Harss B, Heinz A, Henderson D, Janssens RV, Jiang CL, McMichael G, Nolen J, Pardo RC, Paul M, Schiffer JP, Segel RE, Seweryniak D, Siemssen RH, Truran JW, Uusitalo J, Wiedenhover I, Zabransky B. The 44Ti(alpha,p) reaction and its implication on the 44Ti yield in supernovae. Phys Rev Lett 2000; 84:1651-1654. [PMID: 11017592 DOI: 10.1103/physrevlett.84.1651] [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: 10/15/1999] [Indexed: 05/23/2023]
Abstract
Cross sections for the 44Ti(alpha,p)47V reaction which significantly affects the yield of 44Ti in supernovae were measured in the energy range 5.7 MeV</=E(c.m.)</=9 MeV, using a beam of radioactive 44Ti. The cross sections and the deduced astrophysical reaction rates are larger than the results from theoretical calculations by about a factor of 2. The implications of this increase in the reaction rate for the search of supernovae using space-based gamma detectors are discussed.
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Affiliation(s)
- AA Sonzogni
- Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
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29
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Collon P, Cole D, Davids B, Fauerbachs M, Harkewicz R, Kutschera W, Morrissey DJ, Pardo RC, Paul M, Sherrill BM, Steiner M. Measurement of the Long-lived Radionuclide 81Kr in Pre-nuclear and Present-day Atmospheric Krypton. ACTA ACUST UNITED AC 1999. [DOI: 10.1524/ract.1999.85.12.13] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- P. Collon
- Vienna Environmental Research Accelerator, Institut für Radiumforschung und Kernphysik, Universität Wien, Währingerstr. 17, A-1090 Wien, Austria
| | - D. Cole
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - B. Davids
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - M. Fauerbachs
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - R. Harkewicz
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | | | - D. J. Morrissey
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - R. C. Pardo
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - M. Paul
- Racah Institute for Physics, Hebrew University of Jerusalem, 91904 Jerusalem, Israel
| | - B. M. Sherrill
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - M. Steiner
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
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30
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Rehm KE, Paul M, Roberts AD, Jiang CL, Blumenthal DJ, Fischer SM, Gehring J, Henderson D, Nickles J, Nolen J, Pardo RC, Schiffer JP, Segel RE. Astrophysical reaction rate for the 18F(p, alpha )15O reaction. Phys Rev C Nucl Phys 1996; 53:1950-1954. [PMID: 9971152 DOI: 10.1103/physrevc.53.1950] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [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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31
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Rehm KE, Paul M, Roberts AD, Blumenthal DJ, Gehring J, Henderson D, Jiang CL, Nickles J, Nolen J, Pardo RC, Schiffer JP, Segel RE. Study of the 18F(p, alpha )15O reaction at astrophysical energies using a 18F beam. Phys Rev C Nucl Phys 1995; 52:R460-R463. [PMID: 9970616 DOI: 10.1103/physrevc.52.r460] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [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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32
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Dinneen TP, Berrah-Mansour N, Berry HG, Young L, Pardo RC. Precision measurements of relativistic and QED effects in helium-like boron. Phys Rev Lett 1991; 66:2859-2862. [PMID: 10043638 DOI: 10.1103/physrevlett.66.2859] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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