Gamow-Teller strength for the analog transitions to the first T=1/2, J^pi=3/2- states in 13C and 13N and the implications for Type Ia supernovae

A.M. van den Berg; B.A. Brown; D. A. Chamulak; E. F. Brown; G.W. Hitt; H. Akimune; H. Hashimoto; H. Ueno; K. Kawase; K. Nakanishi

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Gamow-Teller strength for the analog transitions to the first T=1/2, J^pi=3/2- states in 13C and 13N and the implications for Type Ia supernovae

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arxiv 0710.2944 v2 pith:AKGFLGTZ submitted 2007-10-16 nucl-ex

Gamow-Teller strength for the analog transitions to the first T=1/2, J^pi=3/2- states in 13C and 13N and the implications for Type Ia supernovae

R.G.T. Zegers , E. F. Brown , H. Akimune , Sam M. Austin , A.M. van den Berg , B.A. Brown , D. A. Chamulak , Y. Fujita

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M. Fujiwara S. Gal`es M.N. Harakeh H. Hashimoto R. Hayami G.W. Hitt M. Itoh T. Kawabata K. Kawase M. Kinoshita K. Nakanishi S. Nakayama S. Okamura Y. Shimbara M. Uchida H. Ueno T. Yamagata M. Yosoi

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The Gamow-Teller strength for the transition from the ground state of 13C to the T=1/2, J^pi=3/2- excited state at 3.51 MeV in 13N is extracted via the 13C(3He,t) reaction at 420 MeV. In contrast to results from earlier (p,n) studies on 13C, a good agreement with shell-model calculations and the empirical unit cross section systematics from other nuclei is found. The results are used to study the analog 13N(e-,v_e)13C reaction, which plays a role in the pre-explosion convective phase of type Ia supernovae. Although the differences between the results from the (3He,t) and (p,n) data significantly affect the deduced electron-capture rate and the net heat-deposition in the star due to this transition, the overall effect on the pre-explosive evolution is small.

Gamow-Teller strength for the analog transitions to the first T=1/2, J^pi=3/2- states in 13C and 13N and the implications for Type Ia supernovae

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