The mean field potential has been very successful in describing the optical model [1]. In alpha-particle scattering under weak or moderate absorption the real part of the optical potential has been well determined up to the internal region by studying the ALAS and nuclear rainbow scattering [2], which has shown that the concept of mean field potential is valid not only for the nucleon but also for the alpha-particle. The mean field potential is also useful for the unified description of bound and scattering states of the composite system. It has been shown that the concept of alpha-cluster is valid not only in light nuclei where spin-orbit force is not strong but also in the beginning of the fp-shell region [2, 3]. The success of the potential model has been confirmed in the microscopic model calculations using an effective two-body interaction [4]. The potential model approach has also been very powerful in the study of alpha-clustering aspects in medium-weight nuclei and heavy nuclei. For example, the long-standing problem of the large alpha-width of the ground state of 212Po, which has not been explained in the shell model, can be reasonably well explained in the mean field potential [5], which describes well alpha-particle scattering from 208Pb. Also the ground band of 94Mo can be well described in the cluster model with a global potential[5].
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