Cluster structures and superdeformation in ²⁸Si

الأصل · EN

We have studied positive-parity states of ²⁸Si using antisymmetrized molecular dynamics (AMD) and multi-configuration mixing (MCM) 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 normal-deformed and superdeformed bands contain large amounts of the ¹²C-¹⁶O and α-²⁴Mg cluster components, respectively. 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.