Excitation and structure change of 24Mg. I: Triaxial deformed mean field in low-lying states

Abstract

By using the antisymmetrized molecular dynamics with Gogny effective interaction, the low-lying spectrum and the E2 transition rates of 24Mg are studied. On the basis of the comparison of the spectrum with observations, the importance of γ deformation in both positive- and negative-parity states is emphasized. Among the seven bands obtained, Kπ = 2 +, 0 - and 3 - bands are triaxial deformed, and the inclusion of the degree of freedom of γ deformation is found to be essential to describe them.