Intruder band mixing in an ab initio description of 12Be
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| Acceso en línea: | |
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| _version_ | 1866910336484900864 |
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| author | McCoy, Anna E. Caprio, Mark A. Maris, Pieter Fasano, Patrick J. |
| author_facet | McCoy, Anna E. Caprio, Mark A. Maris, Pieter Fasano, Patrick J. |
| contents | The spectrum of 12Be exhibits exotic features, e.g., an intruder ground state and shape coexistence, normally associated with the breakdown of a shell closure. While previous phenomenological treatments indicated the ground state has substantial contributions from intruder configurations, it is only with advances in computational abilities and improved interactions that this intruder mixing is observed in ab initio no-core shell model (NCSM) predictions. In this work, we extract electromagnetic observables and symmetry decompositions from the NCSM wave functions to demonstrate that the low-lying positive parity spectrum can be explained in terms of mixing of rotational bands with very different intrinsic structure coexisting within the low-lying spectrum. These observed bands exhibit an approximate SU(3) symmetry and are qualitatively consistent with Elliott model predictions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_12606 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Intruder band mixing in an ab initio description of 12Be McCoy, Anna E. Caprio, Mark A. Maris, Pieter Fasano, Patrick J. Nuclear Theory The spectrum of 12Be exhibits exotic features, e.g., an intruder ground state and shape coexistence, normally associated with the breakdown of a shell closure. While previous phenomenological treatments indicated the ground state has substantial contributions from intruder configurations, it is only with advances in computational abilities and improved interactions that this intruder mixing is observed in ab initio no-core shell model (NCSM) predictions. In this work, we extract electromagnetic observables and symmetry decompositions from the NCSM wave functions to demonstrate that the low-lying positive parity spectrum can be explained in terms of mixing of rotational bands with very different intrinsic structure coexisting within the low-lying spectrum. These observed bands exhibit an approximate SU(3) symmetry and are qualitatively consistent with Elliott model predictions. |
| title | Intruder band mixing in an ab initio description of 12Be |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2402.12606 |