α clustering and superdeformation of 28Si
RIKEN Nishina Center for Accelerator-Based
Science, RIKEN, Wako
2 Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan
3 Creative Research Initiative “Sousei,” Hokkaido University, Sapporo 001-0021, Japan
a e-mail: firstname.lastname@example.org
We have studied positive-parity states of 28Si using antisymmetrized molecular dynamics and multiconﬁguration mixing with constrained variation. Applying constraints to the cluster distance and the quadrupole deformation of the variational calculation, we have obtained basis wave functions that have various structures such as α-24Mg and 12C-16O cluster structures as well as deformed structures. Superposing those basis wave functions, we have obtained a oblate ground state band, a β vibration band, a normal-deformed prolate band, and a superdeformed band. It is found that the superdeformed bands contain large amounts of the α-24Mg cluster components. The results also suggest the presence of two excited bands with the developed α-24Mg cluster structure, where the inter-cluster motion and the 24Mg-cluster deformation play important roles.
© Owned by the authors, published by EDP Sciences, 2010