Half-lives of neutron-rich $^{128-130}$Cd

TL;DR

This study measured the beta-decay half-lives of neutron-rich $^{128-130}$Cd isotopes using gamma-ray spectroscopy, providing data crucial for astrophysical r-process modeling near the $N=82$ shell closure.

Contribution

The paper presents new experimental half-life measurements of $^{128-130}$Cd isotopes using the GRIFFIN spectrometer, improving data accuracy for astrophysical r-process simulations.

Findings

Half-lives of $^{128}$Cd and $^{130}$Cd measured as 246.2(21) ms and 126(4) ms.

Half-lives of $^{129}$Cd states measured as 157(8) ms and 147(3) ms.

Results compared with literature and theoretical models.

Abstract

The $\beta$-decay half-lives of $^{128\text{--}130}$Cd have been measured with the newly commissioned GRIFFIN $\gamma$-ray spectrometer at the TRIUMF-ISAC facility. The time structures of the most intense $\gamma$-rays emitted following the $\beta$-decay were used to determine the half-lives of $^{128}$Cd and $^{130}$Cd to be $T_{1/2}= 246.2(21)$ ms and $T_{1/2}= 126(4)$ ms, respectively. The half-lives of the 3/2$^+$ and 11/2$^-$ states of $^{129}$Cd were measured to be $T_{1/2}(3/2^+)= 157(8)$ ms and $T_{1/2}(11/2^-)= 147(3)$ ms. The half-lives of the Cd isotopes around the $N=82$ shell closure are an important ingredient in astrophysical simulations to derive the magnitude of the second $r$-process abundance peak in the $A\sim130$ region. Our new results are compared with recent literature values and theoretical calculations.