PREPRINT
50311A22-23E1-4123-B9AC-13B41CDB396D

Shell-model calculations of stellar weak interaction rates: II. Weak rates for nuclei in the mass range A=45-65 in supernovae environment

K. Langanke, G. Martinez-Pinedo
arXiv:nucl-th/0001018

Submitted on 10 January 2000

Abstract

Based on large-scale shell model calculations we have determined the electron capture, positron capture and beta-decay rates on more than 100 nuclei in the mass range A=45-65. The rates are given for densities \rho Y_e =10^7-10^{10} mol/cm^3 and temperatures T=10^9-10^{10} K and hence are relevant for both types of supernovae (Type Ia and Type II). The shell model electron capture rates are significantly smaller than currently assumed. For proton-to-baryon ratios Y_e=0.42-0.46 mol/g, the beta-decay rates are faster than the electron capture rates during the core collapse of a massive star.

Preprint

Comment: 16 pages, 10 figures

Subjects: Nuclear Theory; Astrophysics

URL: https://arxiv.org/abs/nucl-th/0001018