Candidates for the 5$\alpha$ condensed state in ${}^{20}$Ne

S. Adachi; Y. Fujikawa; T. Kawabata; H. Akimune; T. Doi; T. Furuno; T. Harada; K. Inaba; S. Ishida; M. Itoh; C. Iwamoto; N. Kobayashi; Y. Maeda; Y. Matsuda; M. Murata; S. Okamoto; A. Sakaue; R. Sekiya; A. Tamii; M. Tsumura

doi:10.1016/j.physletb.2021.136411

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arXiv · 2008.01632

Candidates for the 5$\alpha$ condensed state in ${}^{20}$Ne

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Abstract

We conducted the coincidence measurement of $\alpha$ particles inelastically scattered from ${}^{20}$Ne at $0^{\circ}$ and decay charged particles in order to search for the alpha-particle condensed state. We compared the measured excitation-energy spectrum and decay branching ratio with the statistical-decay-model calculations, and found that the newly observed states at $E_x$ = 23.6, 21.8, and 21.2 MeV in ${}^{20}$Ne are strongly coupled to a candidate for the 4$\alpha$ condensed state in ${}^{16}$O. This result presents the first strong evidence that these states are the candidates for the 5$\alpha$ condensed state.

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S. Adachi, Y. Fujikawa, T. Kawabata, H. Akimune, T. Doi, T. Furuno, T. Harada, K. Inaba, S. Ishida, M. Itoh, C. Iwamoto, N. Kobayashi, Y. Maeda, Y. Matsuda, M. Murata, S. Okamoto, A. Sakaue, R. Sekiya, A. Tamii, M. Tsumura. 2020-08-04. Candidates for the 5$\alpha$ condensed state in ${}^{20}$Ne. https://doi.org/10.1016/j.physletb.2021.136411

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