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

✍ Scribed by K. Langanke; G. Martı́nez-Pinedo

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 361 KB
• Volume: 673
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(00)00131-7

✦ Synopsis

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 ρY 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.