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arXiv · 1204.1994

GT strengths and electron-capture rates for pf-shell nuclei of relevance for late stellar evolution

A. L. Cole·T. S. Anderson·R. G. T. Zegers·Sam M. Austin·B. A. Brown·L. Valdez·S. Gupta·G. W. Hitt·O. Fawwaz
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Abstract

This paper presents a systematic evaluation of the ability of theoretical models to reproduce experimental Gamow-Teller transition strength distributions measured via (n,p)-type charge-exchange reactions at intermediate beam energies. The focus is on transitions from stable nuclei in the pf shell (45<A<64). The impact of deviations between experimental and theoretical Gamow-Teller strength distributions on derived stellar electron-capture rates at densities and temperatures of relevance for Type Ia and Type II supernovae is investigated. The theoretical models included in the study are based on the shell-model, using the KB3G and GXPF1a interactions, and quasiparticle random-phase approximation (QRPA) using ground-state deformation parameters and masses from the finite-range droplet model.

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A. L. Cole, T. S. Anderson, R. G. T. Zegers, Sam M. Austin, B. A. Brown, L. Valdez, S. Gupta, G. W. Hitt, O. Fawwaz. 2012-04-09. GT strengths and electron-capture rates for pf-shell nuclei of relevance for late stellar evolution. https://doi.org/10.1103/physrevc.86.015809

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