Anomalous collective modes in atomic nuclei within the proton-neutron interacting boson model
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arXiv
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Acceso en línea: | |
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| _version_ | 1866912756368670720 |
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| author | Teng, Wei Zhang, Yu Wang, Sheng-Nan Pan, Feng Qi, Chong Draayer, J. P. |
| author_facet | Teng, Wei Zhang, Yu Wang, Sheng-Nan Pan, Feng Qi, Chong Draayer, J. P. |
| contents | Novel collective modes characterized by a $B_{4/2}$ ratio ($\equiv B(E2;4_1^+\rightarrow 2_1^+)/B(E2;2_1^+\rightarrow 0_1^+)$) less than 1.0 that were observed recently have been identified within the proton-neutron interacting boson model (IBM-2) using the consistent-$Q$ Hamiltonian. These modes are shown to give rise to triaxial spectral features, including significant band mixing. The results provide a compelling explanation for the deeply suppressed $B_{4/2}$ ratio observed in $^{166}$W, $^{168,170}$Os, and $^{172}$Pt, offering new insights into the $B(E2)$ anomaly phenomenon in neutron-deficient nuclei. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_09272 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Anomalous collective modes in atomic nuclei within the proton-neutron interacting boson model Teng, Wei Zhang, Yu Wang, Sheng-Nan Pan, Feng Qi, Chong Draayer, J. P. Nuclear Theory Novel collective modes characterized by a $B_{4/2}$ ratio ($\equiv B(E2;4_1^+\rightarrow 2_1^+)/B(E2;2_1^+\rightarrow 0_1^+)$) less than 1.0 that were observed recently have been identified within the proton-neutron interacting boson model (IBM-2) using the consistent-$Q$ Hamiltonian. These modes are shown to give rise to triaxial spectral features, including significant band mixing. The results provide a compelling explanation for the deeply suppressed $B_{4/2}$ ratio observed in $^{166}$W, $^{168,170}$Os, and $^{172}$Pt, offering new insights into the $B(E2)$ anomaly phenomenon in neutron-deficient nuclei. |
| title | Anomalous collective modes in atomic nuclei within the proton-neutron interacting boson model |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2512.09272 |