Deformed Base Antisymmetrized Molecular Dynamics and its Application to 20Ne
Abstract
A new theoretical framework named as deformed base antisymmetrized molecular dynamics that uses the localized triaxially deformed Gaussian as the single particle wave packet is presented. The model space enables us to describe sufficiently well the deformed mean-field structure as well as the cluster structure and their mixed structure within the same framework. The improvement over the original version of the antisymmetrized molecular dynamics which uses the spherical Gaussian is verified by the application to 20 Ne nucleus. The almost pure α + 16 Og.s cluster structure of the Kπ=0- band, the distortion of the cluster structure in the Kπ=0+1 band and the dominance of the deformed mean-field structure of the Kπ=2- band are confirmed and their observed properties are reproduced. Especially, the intra-band E2 transition probabilities in Kπ=0+1 and 2- bands are reproduced without any effective charge. Since it has been long known that the pure α + 16 Og.s. cluster model underestimates the intra-band E2 transitions in the Kπ=0+1 band by about 30%, we consider that this success is due to the sufficient description of the deformed mean-field structure in addition to the cluster structure by the present framework. From the successful description of 20 Ne, we expect that the present framework presents us with a powerful approach for the study of the coexistence and interplay of the mean-field structure and the cluster structure.
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