Triaxial superdeformation in ${}^{40}$Ar

Abstract

Superdeformed (SD) states in ${}^{40}$Ar have been studied using the deformed-basis antisymmetrized molecular dynamics. Low energy states were calculated by the parity and angular momentum projection (AMP) and the generator coordinate method (GCM). Basis wave functions were obtained by the energy variation with a constraint on the quadrupole deformation parameter $\beta$, while other quantities such as triaxiality $\gamma$ were optimized by the energy variation. By the GCM calculation, an SD band was obtained just above the ground state (GS) band. The SD band involves a $K^{\pi }=2^{+}$ side band due to the triaxiality. The calculated electric quadrupole transition strengths of the SD band reproduce the experimental values appropriately. Triaxiality is significant for understanding low-lying states.

11 pages, 4 figures

References in corpus (4)

• Cluster structures and superdeformation in ${}^{28}$Si
• Clustering and Triaxial Deformations of ${}^{40}$Ca
• Superdeformation in Asymmetric N$>$Z Nucleus ${}^{40}$Ar
• Deformations and clustering correlations in $p$- and $sd$-shell nuclei using the Gogny and Skyrme interactions

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• From cluster structures to nuclear molecules: the role of nodal structure of the single-particle wave functions
• Backbendings of Superdeformed bands in ${}^{36,40}$Ar
• Cluster structures, ellipsoidal shapes and nuclear molecules in light A=12-50 nuclei