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

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arxiv 0904.3645 v1 pith:CMQGHMEM submitted 2009-04-23 nucl-ex

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

G.W. Hitt , R.G.T. Zegers , Sam M. Austin , D. Bazin , A. Gade , D. Galaviz , C.J. Guess , M. Horoi
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M.E. Howard Y. Shimbara E.E. Smith C. Tur
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keywords ratesreactioncompareddatadistributionsexperimentalgamow-tellerresults
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The 64-Zn(t,3-He) reaction has been studied using a secondary triton beam of 115 MeV/nucleon to extract the Gamow-Teller transition-strength distribution to 64-Cu. The results were compared with shell-model calculations using the pf-shell effective interactions KB3G and GXPF1A and with existing data from the 64-Zn(d,2-He) 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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