Gamow-Teller transitions to Cu64 measured with the Zn64(t,He3) reaction

G. W. Hitt, R. G. T. Zegers, Sam M. Austin, D. Bazin, A. Gade, D. Galaviz, C. J. Guess, M. Horoi, M. E. Howard, W. D. M. Rae, Y. Shimbara, E. E. Smith, and C. Tur
Phys. Rev. C 80, 014313 – Published 16 July 2009

Abstract

The Zn64(t,He3) reaction has been studied by using a secondary triton beam of 115 MeV/nucleon to extract the Gamow-Teller transition-strength distribution to Cu64. The results were compared with shell-model calculations with the pf-shell effective interactions KB3G and GXPF1A and with existing data from the Zn64(d,He2) 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.

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  • Received 22 April 2009

DOI:https://doi.org/10.1103/PhysRevC.80.014313

©2009 American Physical Society

Authors & Affiliations

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

  • *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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Vol. 80, Iss. 1 — July 2009

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