Cluster-breaking and reconfiguration effects in $_Λ^{12}\rm{B}$ hypernucleus
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arXiv
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908827109031936 |
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| author | Tian, Jiaqi Lyu, Mengjiao Dote, Akinobu Cheng, Zheng Myo, Takayuki Isaka, Masahiro Horiuchi, Hisashi Takemoto, Hiroki Toki, Hiroshi Wan, Niu Zhao, Qing |
| author_facet | Tian, Jiaqi Lyu, Mengjiao Dote, Akinobu Cheng, Zheng Myo, Takayuki Isaka, Masahiro Horiuchi, Hisashi Takemoto, Hiroki Toki, Hiroshi Wan, Niu Zhao, Qing |
| contents | We investigate the cluster-breaking effect and spatial distribution of negative-parity states in the $_Λ^{12}\rm{B}$ hypernucleus using the Hyper-Brink model with cluster-breaking(CB-Hyper-Brink) optimized via Control Neural Network (Ctrl.NN). The results demonstrate that the inclusion of cluster-breaking is essential for accurately reproducing the observed low-lying energy levels and for making reliable predictions of the Hoyle-analog state 1-4 in $_Λ^{12}\rm{B}$. Cluster-breaking manifests as strong spin-orbit correlations and the dissolution of ideal cluster configurations, as revealed by the analysis of one-body spin-orbit operator expectation values and the spatial overlap with projected cluster bases. The interplay between short-range repulsion and intermediate-range attraction in the Lambda N interaction induces the cluster reconfiguration effect, which is characterized by the coexistence of Lambda-alpha and Lambda-triton correlations; this reconfiguration effect leads to a modest stabilization and shrinkage of cluster structures. The variation in electric quadrupole transition strengths, B(E2), between the ground and Hoyle-analog states serves as a sensitive probe for the degree of cluster-breaking, providing direct evidence for its physical relevance. These findings highlight the crucial role of cluster-breaking in characterizing the hypernuclear structure and offer a comprehensive framework for understanding the interplay between clustering and shell-model dynamics in hypernuclei. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_11937 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Cluster-breaking and reconfiguration effects in $_Λ^{12}\rm{B}$ hypernucleus Tian, Jiaqi Lyu, Mengjiao Dote, Akinobu Cheng, Zheng Myo, Takayuki Isaka, Masahiro Horiuchi, Hisashi Takemoto, Hiroki Toki, Hiroshi Wan, Niu Zhao, Qing Nuclear Theory We investigate the cluster-breaking effect and spatial distribution of negative-parity states in the $_Λ^{12}\rm{B}$ hypernucleus using the Hyper-Brink model with cluster-breaking(CB-Hyper-Brink) optimized via Control Neural Network (Ctrl.NN). The results demonstrate that the inclusion of cluster-breaking is essential for accurately reproducing the observed low-lying energy levels and for making reliable predictions of the Hoyle-analog state 1-4 in $_Λ^{12}\rm{B}$. Cluster-breaking manifests as strong spin-orbit correlations and the dissolution of ideal cluster configurations, as revealed by the analysis of one-body spin-orbit operator expectation values and the spatial overlap with projected cluster bases. The interplay between short-range repulsion and intermediate-range attraction in the Lambda N interaction induces the cluster reconfiguration effect, which is characterized by the coexistence of Lambda-alpha and Lambda-triton correlations; this reconfiguration effect leads to a modest stabilization and shrinkage of cluster structures. The variation in electric quadrupole transition strengths, B(E2), between the ground and Hoyle-analog states serves as a sensitive probe for the degree of cluster-breaking, providing direct evidence for its physical relevance. These findings highlight the crucial role of cluster-breaking in characterizing the hypernuclear structure and offer a comprehensive framework for understanding the interplay between clustering and shell-model dynamics in hypernuclei. |
| title | Cluster-breaking and reconfiguration effects in $_Λ^{12}\rm{B}$ hypernucleus |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2508.11937 |