Weak interaction rates of sd-shell Urca pairs in stellar environment using a shell-model approach

2025/08/07 by Sharma, Shweta, Srivastava, Praveen C., Suzuki, Toshio
#FOS: Physical sciences #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th)

paper · doi:10.48550/arxiv.2508.05456

Abstract

In this work, the weak interaction rates of sd-shell nuclei in the hot and dense stellar environment are calculated using the shell model. The \it ab initio effective interactions are employed for the calculation of Gamow-Teller strengths and weak rates in addition to the phenomenological interaction. The weak rates are evaluated in a fine grid of density and temperature. The electron capture and β^--decay rates of Urca pairs of nuclei with A = 23, 25, 29, 31 and 33 are evaluated as a function of log₁₀ ρY_e and the corresponding Urca density is obtained. The screening effects are also included for the evaluation of these stellar weak rates. In addition, the intrinsic cooling strength is evaluated for A=29,31 and 33 Urca pairs in neutron star crusts. The stellar weak rates, along with the neutrino energy emitted and the gamma heat production, are tabulated for A = 29-39 nuclei.

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