Magnetic dipole $γ$-ray strength functions of heavy nuclei in the configuration-interaction shell model
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866909449184083968 |
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| author | Alhassid, Y. Fanto, P. Mercenne, A. |
| author_facet | Alhassid, Y. Fanto, P. Mercenne, A. |
| contents | A low-energy enhancement (LEE) has been observed in the deexcitation $γ$-ray strength function ($γ$SF) of compound nuclei. The LEE has been a subject of intense experimental and theoretical interest since its discovery, and, if the LEE persists in heavy neutron-rich nuclei, it would have significant effects on calculations of r-process nucleosynthesis. Standard configuration-interaction (CI) shell-model calculations in medium-mass nuclei have attributed the LEE to the magnetic dipole $γ$SF but such calculations are computationally intractable in heavy nuclei. We review a combination of beyond-mean-field many-body methods within the framework of the CI shell model that enables the calculation of $γ$SF in heavy nuclei, and discuss the recent theoretical identification of a LEE in the magnetic dipole $γ$SF of lanthanide isotopes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_00591 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Magnetic dipole $γ$-ray strength functions of heavy nuclei in the configuration-interaction shell model Alhassid, Y. Fanto, P. Mercenne, A. Nuclear Theory A low-energy enhancement (LEE) has been observed in the deexcitation $γ$-ray strength function ($γ$SF) of compound nuclei. The LEE has been a subject of intense experimental and theoretical interest since its discovery, and, if the LEE persists in heavy neutron-rich nuclei, it would have significant effects on calculations of r-process nucleosynthesis. Standard configuration-interaction (CI) shell-model calculations in medium-mass nuclei have attributed the LEE to the magnetic dipole $γ$SF but such calculations are computationally intractable in heavy nuclei. We review a combination of beyond-mean-field many-body methods within the framework of the CI shell model that enables the calculation of $γ$SF in heavy nuclei, and discuss the recent theoretical identification of a LEE in the magnetic dipole $γ$SF of lanthanide isotopes. |
| title | Magnetic dipole $γ$-ray strength functions of heavy nuclei in the configuration-interaction shell model |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2401.00591 |