Internuclear interaction and cluster structure

As compared with the establishment of nucleon-nucleus optical potential, nucleus-nucleus optical potential has been in the state far away from being established for long time. The reason is explained. The microscopic shallow potential has been unable to reproduce the features. From the orthogonal condition model based on the microscopic cluster theory, deep potential can be supported. The exchange potential in the double folding model is attraction, and with the rise of incident energy, the potential becomes shallower. In the microscopic shallow potential, the exchange potential is large repulsion, and becomes deeper with the rise of incident energy. One of the major purposes of the microscopic study on internuclear potential is to answer theoretically about the most basic properties of the internuclear potential. The authors used the RGM (resonating group method)-WKB (Wentzel-Kramers-Brillouin) method for the microscopic research on internuclear potential. This method is discussed. The authors verified that the RGM reproduced well the scattering data in wide energy range in α+O-16 and α+Ca-40 systems. The nucleus-nucleus potential determined in wide incident energy range gives the unified description of scattering at high energy and cluster structure at low energy. The typical examples are shown. (K.I.)