Shell model half-lives for r-process N=82 nuclei

TL;DR

This study uses advanced shell-model calculations to accurately predict half-lives and neutron-branching probabilities of N=82 r-process nuclei, improving upon previous models with larger space and refined interactions.

Contribution

Introduces a larger model space and improved residual interaction in shell-model calculations, enhancing predictions for N=82 r-process nuclei.

Findings

Good agreement with experimental half-lives and Qβ-values

Predicted half-lives align with energy-density functional estimates

Model successfully reproduces spectroscopic data around A=130

Abstract

We have performed shell-model calculations of the half-lives and neutron-branching probabilities of the r-process waiting point nuclei at the magic neutron number N=82. These new calculations use a larger model space than previous shell model studies and an improved residual interaction which is adjusted to recent spectroscopic data around A=130. Our shell-model results give a good account of all experimentally known half-lives and $Q_\beta$-values for the N=82 r-process waiting point nuclei. Our half-life predictions for the N=82 nuclei with Z=42--46 agree well with recent estimates based in the energy-density functional method.