Signature of a possible $$\alpha $$-cluster state in $$N=Z$$ doubly-magic $$^{56}$$Ni

C. Stodel, U. Garg, Hidetoshi Akimune, G. Lhoutellier, H. Savajols, M. A. Najafi, L. Perrot, E. Khan, M.N. Harakeh, Marine Vandebrouck, G. F. Grinyer, J. Pancin, O. Kamalou, S. M. Lukyanov, J. Van de Walle, M. Caamaño, Catherine Rigollet, T. Roger, B. Fernández-Domínguez, Julien Gibelin, H. Bouzomita, L. Caceres, N. L. Achouri, M. Sénoville, B. Bastin, Riccardo Raabe, Nasser Kalantar-Nayestanaki, L. Suen, J. F. Libin, K. Mazurek, S. Bagchi, S. Sambi, A. Krasznahorkay, J. C. Thomas, Y. E. Penionzhkevich, Franck Delaunay, M. Fujiwara, S. Damoy, K. Boretzky

doi:10.48550/arxiv.2010.15478

An inelastic $��$-scattering experiment on the unstable $N=Z$, doubly-magic $^{56}$Ni nucleus was performed in inverse kinematics at an incident energy of 50 A.MeV at GANIL. High multiplicity for $��$-particle emission was observed within the limited phase-space of the experimental setup. This observation cannot be explained by means of the statistical-decay model. The ideal classical gas model at $kT$ = 0.4 MeV reproduces fairly well the experimental momentum distribution and the observed multiplicity of $��$ particles corresponds to an excitation energy around 96 MeV. The method of distributed $m��$-decay ensembles is in agreement with the experimental results if we assume that the $��$-gas state in $^{56}$Ni exists at around $113^{+15}_{-17}$ MeV. These results suggest that there may exist an exotic state consisting of many $��$ particles at the excitation energy of $113^{+15}_{-17}$ MeV.

Accepted for publication in the European Physical Journal A

Signature of a possible $$\alpha $$-cluster state in $$N=Z$$ doubly-magic $$^{56}$$Ni

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Signature of a possible $$\alpha $$-cluster state in $$N=Z$$ doubly-magic $$^{56}$$Ni

この論文をさがす

説明

収録刊行物

キーワード

詳細情報 詳細情報について

書き出し

問題の指摘

詳細情報詳細情報について