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

2000/01/10 by K. Langanke, G. Martinez-Pinedo · 2 citations
Physics and Astronomy · #nucl-th #astro-ph

paper · pdf · doi:10.1016/s0375-9474(00)00131-7

published as Nucl.Phys.A673:481-508,2000 · 16 pages, 10 figures

arxiv created 2000/01/10 · arxiv updated 2011/05/05

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 ρY_e =10⁷-10¹⁰ mol/cm³ and temperatures T=10⁹-10¹⁰ 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.

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