Abstract
We have studied the positive‐parity states of 40Ca using antisymmetrized molecular dynamics (AMD) and the generator coordinate method (GCM). Imposing two different kinds of constraints on the variational calculation, we have found various kinds of 40Ca structures such as a deformed‐shell structure, as well as α‐36Ar and 12C‐28Si cluster structures. After the GCM calculation, we obtained a normal‐deformed band and a superdeformed band together with their side bands associated with triaxial deformation. The calculated B(E2) values agreed well with empirical data. It was also found that the normal‐deformed and superdeformed bands contain α‐36Ar and 12C‐28Si cluster structure components, respectively. This leads to the presence of an α‐36Ar higher‐nodal band occurring above the normal‐deformed band.
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