Gamow shell model description of exceptional point in $^7$Li
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866917132713852928 |
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| author | Ochoa, David Cardona Płoszajczak, Marek Michel, Nicolas |
| author_facet | Ochoa, David Cardona Płoszajczak, Marek Michel, Nicolas |
| contents | We report the first identification of an exceptional point (EP) within the Gamow Shell Model in the Coupled Channels representation (GSM-CC). In the spectrum of $^{7}$Li, an EP is found for the $5/2^-$ doublet, where the two states coalesce in both energy and width, the phase rigidity vanishes, and the S-matrix develops a double pole. These features manifest directly in observables: the elastic cross section acquires a split-peak structure, and the phase shift shows a single $2π$ jump. This work demonstrates that GSM-CC provides a powerful framework to explore EP phenomena in nuclei and their experimental signatures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_01928 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Gamow shell model description of exceptional point in $^7$Li Ochoa, David Cardona Płoszajczak, Marek Michel, Nicolas Nuclear Theory We report the first identification of an exceptional point (EP) within the Gamow Shell Model in the Coupled Channels representation (GSM-CC). In the spectrum of $^{7}$Li, an EP is found for the $5/2^-$ doublet, where the two states coalesce in both energy and width, the phase rigidity vanishes, and the S-matrix develops a double pole. These features manifest directly in observables: the elastic cross section acquires a split-peak structure, and the phase shift shows a single $2π$ jump. This work demonstrates that GSM-CC provides a powerful framework to explore EP phenomena in nuclei and their experimental signatures. |
| title | Gamow shell model description of exceptional point in $^7$Li |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2510.01928 |