Signature of a possible $$\alpha $$α -cluster state in $$N=Z$$N=Z doubly-magic $$^{56}$$56 Ni
2020
An inelastic
$$\alpha $$
-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
$$\alpha $$
-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
$$\alpha $$
particles corresponds to an excitation energy around 96 MeV. The method of distributed
$$m\alpha $$
-decay ensembles is in agreement with the experimental results if we assume that the
$$\alpha $$
-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
$$\alpha $$
particles at the excitation energy of
$$113^{+15}_{-17}$$
MeV.
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