Bose-Einstein condensation of five $α$ clusters in $^{20}$Ne and supersolidity
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866913689172443136 |
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| author | Ohkubo, S. Takahashi, J. Yamanaka, Y. |
| author_facet | Ohkubo, S. Takahashi, J. Yamanaka, Y. |
| contents | We show that the five $α$ cluster states recently observed in $^{20}$Ne, slightly above the five $α$ threshold energy, are Bose-Einstein condensates of five $α$ clusters. The states are described well using a superfluid cluster model, where the order parameter is defined. We suggest that the the five $α$ states are fragmented. Theory predicts the emergence of a five $α$ rotational roton band characterized by a large moment of inertia. This band is formed through roton excitations of the five $α$ BEC vacuum and possesses dual properties of superfluidity and crystallinity, a property of supersolidity. The persistent existence of such a roton bandis discussed and confirmed for the four $α$ condensate above the four $α$ threshold in $^{16}$O and the three $α$ condensate above the three $α$ threshold in $^{12}$C. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_08901 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Bose-Einstein condensation of five $α$ clusters in $^{20}$Ne and supersolidity Ohkubo, S. Takahashi, J. Yamanaka, Y. Nuclear Theory Quantum Gases Nuclear Experiment We show that the five $α$ cluster states recently observed in $^{20}$Ne, slightly above the five $α$ threshold energy, are Bose-Einstein condensates of five $α$ clusters. The states are described well using a superfluid cluster model, where the order parameter is defined. We suggest that the the five $α$ states are fragmented. Theory predicts the emergence of a five $α$ rotational roton band characterized by a large moment of inertia. This band is formed through roton excitations of the five $α$ BEC vacuum and possesses dual properties of superfluidity and crystallinity, a property of supersolidity. The persistent existence of such a roton bandis discussed and confirmed for the four $α$ condensate above the four $α$ threshold in $^{16}$O and the three $α$ condensate above the three $α$ threshold in $^{12}$C. |
| title | Bose-Einstein condensation of five $α$ clusters in $^{20}$Ne and supersolidity |
| topic | Nuclear Theory Quantum Gases Nuclear Experiment |
| url | https://arxiv.org/abs/2502.08901 |