Indispensability of cross-shell contributions in neutron resonance spacing
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866910330801618944 |
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| author | Ghosh, T. Sangeeta Maheshwari, B. Saxena, G. Agrawal, B. K. |
| author_facet | Ghosh, T. Sangeeta Maheshwari, B. Saxena, G. Agrawal, B. K. |
| contents | Spin and parity dependent nuclear level densities (NLDs) are obtained for configuration interaction shell model using a numerically efficient spectral distribution method. The calculations are performed for $^{24}$Na, $^{25,26,27}$Mg nuclei using full $sd$-$pf$ model space that incorporates the cross-shell excitations from $sd$ to $pf$-shell. The NLDs so obtained are then employed to determine the s-wave neutron resonance spacing (D$_0$) which is one of the crucial inputs for the predictions of astrophysical reaction rates. Though the considered nuclei are not neutron-rich, the contributions from cross-shell excitations to $pf$-shell are indispensable to explain the experimental data for D$_0$ which otherwise are significantly overestimated. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_08889 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Indispensability of cross-shell contributions in neutron resonance spacing Ghosh, T. Sangeeta Maheshwari, B. Saxena, G. Agrawal, B. K. Nuclear Theory Spin and parity dependent nuclear level densities (NLDs) are obtained for configuration interaction shell model using a numerically efficient spectral distribution method. The calculations are performed for $^{24}$Na, $^{25,26,27}$Mg nuclei using full $sd$-$pf$ model space that incorporates the cross-shell excitations from $sd$ to $pf$-shell. The NLDs so obtained are then employed to determine the s-wave neutron resonance spacing (D$_0$) which is one of the crucial inputs for the predictions of astrophysical reaction rates. Though the considered nuclei are not neutron-rich, the contributions from cross-shell excitations to $pf$-shell are indispensable to explain the experimental data for D$_0$ which otherwise are significantly overestimated. |
| title | Indispensability of cross-shell contributions in neutron resonance spacing |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2402.08889 |