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Phys. Rev. C 74, 034333 (2006) [13 pages]

Measurement of the Gamow-Teller strength distribution in 58Co via the 58Ni(t,3He) reaction at 115 MeV/nucleon

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A. L. Cole1,2,*, H. Akimune3, Sam M. Austin1,2,4, D. Bazin1, A. M. van den Berg5, G. P. A. Berg6,7, J. Brown8, I. Daito9, Y. Fujita10, M. Fujiwara9,11, S. Gupta1,2, K. Hara11, M. N. Harakeh12, J. Jänecke13, T. Kawabata14, T. Nakamura15, D. A. Roberts13, B. M. Sherrill1,2,4, M. Steiner1, H. Ueno16, and R. G. T. Zegers1,2,4,†
1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA
2Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
3Department of Physics, Konan University, 8-9-1 Okamoto Higashinda, Kobe, Hyogo, 658-8501, Japan
4Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
5Kernfysisch Versneller Instituut, University of Groningen, Zernikelaan 25, 9747 AA Groningen, The Netherlands
6Department of Physics, University of Notre Dame, Indiana 46556-5670, USA
7Joint Institute for Nuclear Astrophysics, University of Notre Dame, Indiana 46556-5670, USA
8Department of Physics, Wabash College, Crawfordsville, Indiana 47933, USA
9Kansai Photon Science Institute, Japan Atomic Research Institute, Kizu Kyoto 619-0215, Japan
10Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
11Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
12Kernfysisch Versneller Instituut, Zernikelaan 25 9747 AA Groningen, The Netherlands
13Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA
14Center for Nuclear Study, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
15Tokyo Institute of Technology, 2-12-1 O-Okayama, Tokyo 152-8550, Japan
16Applied Nuclear Physics Laboratory, RIKEN, Wako, Saitama 351-0198, Japan

Received 20 March 2006; published 29 September 2006

Electron capture and β decay play important roles in the evolution of presupernovae stars and their eventual core collapse. These rates are normally predicted through shell-model calculations. Experimentally determined strength distributions from charge-exchange reactions are needed to test modern shell-model calculations. We report on the measurement of the Gamow-Teller strength distribution in 58Co from the 58Ni(t,3He) reaction with a secondary triton beam of an intensity of ~106 pps at 115 MeV/nucleon and a resolution of ~250 keV. Previous measurements with the 58Ni(n,p) and the 58Ni(d,2He) reactions were inconsistent with each other. Our results support the latter. We also compare the results to predictions of large-scale shell-model calculations using the KB3G and GXPF1 interactions and investigate the impact of differences between the various experiments and theories in terms of the weak rates in the stellar environment. Finally, the systematic uncertainties in the normalization of the strength distribution extracted from 58Ni(3He, t) are described and turn out to be nonnegligible due to large interferences between the ΔL=0,ΔS=1 Gamow-Teller amplitude and the ΔL=2,ΔS=1 amplitude.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.74.034333
DOI:
10.1103/PhysRevC.74.034333
PACS:
27.40.+z, 25.45.Kk, 25.55.Hp, 26.50.+x

*Present address: Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA.

†Electronic address: zegers@nscl.msu.edu

 
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