# $\beta$-decay properties of waiting point nuclei for astrophysical applications

## TL;DR

This paper presents a microscopic pn-QRPA calculation of $eta$-decay properties for waiting point nuclei with neutron magic shells, highlighting the importance of forbidden transitions for astrophysical r-process modeling.

## Contribution

It introduces a comprehensive pn-QRPA approach including forbidden transitions, improving the accuracy of $eta$-decay property predictions for key astrophysical nuclei.

## Key findings

- Good agreement with experimental half-lives
- Forbidden transitions significantly reduce half-lives in some cases
- Model satisfies Ikeda sum rule for even-even nuclei

## Abstract

We report microscopic calculation of key $\beta$-decay properties for some of the crucial waiting point species having neutron closed magic shells 50 and 82. Our calculation bear astrophysical significance vis-\'{a}-vis speeding of the $r$-process. The $\beta$-decay properties include half-lives, energy rates of $\beta$-delayed neutrons and their emission probabilities, both under terrestrial and stellar conditions. We perform a pn-QRPA calculation with a separable multi-shell interaction and include both allowed and unique first-forbidden (U1F) transitions in our calculation. We compare our results with previous calculations and measured data. Our calculation is in good agreement with the experimental data. For certain cases, we noted a significant decrease in the half-life calculation with the contribution of U1F transitions. This is in contradiction to the shell model study where only for $N$ = 126 waiting-point nuclei, the forbidden transitions were reported to significantly reduce the calculated half-lives. Our model fulfills the Ikeda sum rule for even-even cases. For odd-A cases the rule is violated by up to 15$\%$ for $^{125}$Tc.