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

Based on large-scale shell-model calculations we have determined the electron capture, positron capture and beta-decay rates for more than 100 nuclei in the mass range A=45–65. The rates are given for densities View the MathML source–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 View the MathML source–0.46 mol/g, the beta-decay rates are faster than the electron capture rates during the core collapse of a massive star.