Weak interaction rates of $sd$-shell Urca pairs in stellar environment using a shell-model approach
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866918117369708544 |
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| author | Sharma, Shweta Srivastava, Praveen C. Suzuki, Toshio |
| author_facet | Sharma, Shweta Srivastava, Praveen C. Suzuki, Toshio |
| contents | 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 $\log_{10} ρY_e$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_05456 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Weak interaction rates of $sd$-shell Urca pairs in stellar environment using a shell-model approach Sharma, Shweta Srivastava, Praveen C. Suzuki, Toshio Nuclear Theory Nuclear Experiment 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 $\log_{10} ρY_e$ 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. |
| title | Weak interaction rates of $sd$-shell Urca pairs in stellar environment using a shell-model approach |
| topic | Nuclear Theory Nuclear Experiment |
| url | https://arxiv.org/abs/2508.05456 |