Nuclear Weak Rates and Nuclear Weak Processes in Stars

Understand

Nuclear weak rates in stellar environments are obtained by shell-model calculations including Gamow-Teller (GT) and spin-dipole transitions, and applied to nuclear weak processes in stars.

• The important roles of accurate weak rates for the study of astrophysical processes are pointed out.
• The weak rates in $sd$-shell are used to study the evolution of ONeMg cores in stars with 8-10 M$_{\odot}$.
• Cooling of the core by nuclear Urca processes, and the heating by double e-captures on $^{20}$Ne are studied.