α-cluster excited states in 32 S are investigated with an extended 28 Si+α cluster model, in which the 28 Si core deformation and rotation, and the α-cluster breaking are incorporated. In the GCM calculation with the extended 28 Si+α cluster model, the α-cluster excited states are obtained near the 28 Si+α threshold energy. The 28 Si core deformation and rotation effects, and also the α-clusters breaking in the 28 Si+α system are discussed. It is found that the rotation of the oblately deformed 28 Si core gives a significant effect to the α-cluster excited states whereas the α-cluster breaking gives only a minor effect.

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In this paper, we discuss cluster features in light stable and unstable nuclei. We theoretically investigate the structures of neutron-rich Be nuclei and discuss their molecular orbital bond structure and its role in the vanishing of the neutron magic number N = 8. The two-body cluster resonances in highly excited states near the threshold energy are also discussed. The cluster excited states of 9 Li are investigated, and 6 He+t cluster resonance states are predicted near the threshold energy in 9 Li. The similarities and differences in the cluster features between 9 Li and 10 Be are also discussed.