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Signature of a possible α-cluster state in N=Z doubly-magic 56Ni.

Authors :
Bagchi, S.
Akimune, H.
Gibelin, J.
Harakeh, M. N.
Kalantar-Nayestanaki, N.
Achouri, N. L.
Bastin, B.
Boretzky, K.
Bouzomita, H.
Caamaño, M.
Càceres, L.
Damoy, S.
Delaunay, F.
Fernández-Domínguez, B.
Fujiwara, M.
Garg, U.
Grinyer, G. F.
Kamalou, O.
Khan, E.
Krasznahorkay, A.
Source :
European Physical Journal A -- Hadrons & Nuclei; Nov2020, Vol. 56 Issue 11, p1-8, 8p
Publication Year :
2020

Abstract

An inelastic α -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 α -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 α particles corresponds to an excitation energy around 96 MeV. The method of distributed m α -decay ensembles is in agreement with the experimental results if we assume that the α -gas state in 56 Ni exists at around 113 - 17 + 15 MeV. These results suggest that there may exist an exotic state consisting of many α particles at the excitation energy of 113 - 17 + 15 MeV. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
14346001
Volume :
56
Issue :
11
Database :
Complementary Index
Journal :
European Physical Journal A -- Hadrons & Nuclei
Publication Type :
Academic Journal
Accession number :
147686765
Full Text :
https://doi.org/10.1140/epja/s10050-020-00294-7