Coexistence of cluster structure and mean-field-type structure in medium-weight nuclei

We have studied the coexistence of cluster structure and mean-field-type structure in 40Ca using Antisymmetrized Molecular Dynamics (AMD) + Generator Coordinate Method (GCM). By energy variation with constraint, we calculated GCM basis wave functions. Superposing cluster structure wave functions and mean-field-type structure wave function, we found that α-36Ar and 12C-28Si cluster structure are important components of normal-deformed (ND) band of 40Ca and that of superdeformed (SD) band of 40Ca, respectively.