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Phys. Rev. C 80, 014313 (2009) [9 pages]

Gamow-Teller transitions to 64Cu measured with the 64Zn(t,3He) reaction

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G. W. Hitt1,2,3, R. G. T. Zegers1,2,3,*, Sam M. Austin1,3, D. Bazin1, A. Gade1,2, D. Galaviz1,3,†, C. J. Guess1,2,3, M. Horoi4, M. E. Howard3,5, W. D. M. Rae6, Y. Shimbara1,3,‡, E. E. Smith3,5, and C. Tur1,3
1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA
2Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
3Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
4Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA
5Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA
6Garsington, Oxfordshire, OX44, United Kingdom

Received 22 April 2009; published 16 July 2009

The 64Zn(t,3He) reaction has been studied by using a secondary triton beam of 115 MeV/nucleon to extract the Gamow-Teller transition-strength distribution to 64Cu. The results were compared with shell-model calculations with the pf-shell effective interactions KB3G and GXPF1A and with existing data from the 64Zn(d,2He) reaction. Whereas the experimental results exhibited good consistency, neither of the theoretical predictions managed to reproduce the data. The implications for electron-capture rates during late stellar evolution were investigated. The rates based on the theoretical strength distributions are lower by factors of 3.5–5 compared to the rates based on experimental strength distributions.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.80.014313
DOI:
10.1103/PhysRevC.80.014313
PACS:
21.60.Cs, 25.55.Kr, 26.30.-k, 27.50.+e

*zegers@nscl.msu.edu

†Present address: Centro de Fisica Nuclear da Universidade de Lisboa, P-1649-003 Lisboa, Portugal.

‡Present address: Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan.

 
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