Superdeformation and clustering in ${}^{40}$Ca studied with Antisymmetrized Molecular Dynamics

Abstract

Deformed states in ${}^{40}$Ca are investigated with a method of antisymmetrized molecular dynamics. Above the spherical ground state, rotational bands arise from a normal deformation and a superdeformation as well as an oblate deformation. The calculated energy spectra and $E2$ transition strengths in the superdeformed band reasonably agree to the experimental data of the superdeformed band starting from the $0_3^{+}$ state at 5.213 MeV. By the analysis of single-particle orbits, it is found that the superdeformed state has particle-hole nature of an $8p$-$8h$ configuration. One of new findings is parity asymmetric structure with ${}^{12}$C+${}^{28}$Si-like clustering in the superdeformed band. We predict that ${}^{12}$C+${}^{28}$Si molecular bands may be built above the superdeformed band due to the excitation of inter-cluster motion. They are considered to be higher nodal states of the superdeformed state. We also suggest negative-parity bands caused by the parity asymmetric deformation.

13 figures, submitted to Phys. Rev. C

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Cited by in corpus (10)

• Coexistence of spherical states with deformed and superdeformed bands in doubly magic 40-Ca; A shell model challenge
• From superdeformation to extreme deformation and clusterization in the N~Z nuclei of the A~40 mass region
• Cluster structures and superdeformation in ${}^{28}$Si
• Clustering and Triaxial Deformations of ${}^{40}$Ca
• Beyond-mean-field study of the hyperon impurity effect in hypernuclei with shape coexistence
• Superdeformed $\Lambda$ hypernuclei with antisymmetrized molecular dynamics
• Triaxial superdeformation in ${}^{40}$Ar
• Signature dependent triaxiality for shape evolution from superdeformation in rapidly rotating ${}^{40}$Ca and ${}^{41}$Ca
• Backbendings of Superdeformed bands in ${}^{36,40}$Ar
• alpha+28Si and 16O+16O molecular states, and their isoscalar monopole strengths