Three-body structures of low-lying nuclear states of $^8$Li
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arXiv
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| Format: | Preprint |
| Veröffentlicht: |
2025
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| author | Garrido, E. Jensen, A. S. |
| author_facet | Garrido, E. Jensen, A. S. |
| contents | The four nucleons in $^8$Li outside the $α$-particle ($α=^4$He) can be divided into pairs of one neutron ($n$) and 3 nucleons in the triton ($t=^3$H), or 2 in the deuteron ($d=^2$H) and two neutrons in a dineutron ($^2n$). The corresponding three-body structures, $α$+$t$+$n$ or $α$+$d$+$^2n$, are suggested to describe the bulk part of the low-energy ($<10$~MeV) states of $^8$Li. Several breakup thresholds influence the structures and possible decays. We calculate the three-body structures of the various $J^π$ states, where different clustering appear, e.g. $^7$Li*+$n$, $^6$Li*$+^2n$, $^6$He*$+d$. The experimental $^8$Li spectrum can be reproduced with fine tuning by a three-body potential parameter. Three unobserved $0^+$ and an excited 2$^+$ states are found. All states appear as bound states or resonances. The lowest or highest energies have cluster structures, $α$+$t$+$n$ or $α$+$d$+$^2n$, respectively. We give calculated energy and width (if possible), geometry, and partial wave decomposition for all states. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_04086 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Three-body structures of low-lying nuclear states of $^8$Li Garrido, E. Jensen, A. S. Nuclear Theory Nuclear Experiment The four nucleons in $^8$Li outside the $α$-particle ($α=^4$He) can be divided into pairs of one neutron ($n$) and 3 nucleons in the triton ($t=^3$H), or 2 in the deuteron ($d=^2$H) and two neutrons in a dineutron ($^2n$). The corresponding three-body structures, $α$+$t$+$n$ or $α$+$d$+$^2n$, are suggested to describe the bulk part of the low-energy ($<10$~MeV) states of $^8$Li. Several breakup thresholds influence the structures and possible decays. We calculate the three-body structures of the various $J^π$ states, where different clustering appear, e.g. $^7$Li*+$n$, $^6$Li*$+^2n$, $^6$He*$+d$. The experimental $^8$Li spectrum can be reproduced with fine tuning by a three-body potential parameter. Three unobserved $0^+$ and an excited 2$^+$ states are found. All states appear as bound states or resonances. The lowest or highest energies have cluster structures, $α$+$t$+$n$ or $α$+$d$+$^2n$, respectively. We give calculated energy and width (if possible), geometry, and partial wave decomposition for all states. |
| title | Three-body structures of low-lying nuclear states of $^8$Li |
| topic | Nuclear Theory Nuclear Experiment |
| url | https://arxiv.org/abs/2502.04086 |