Deformed-basis antisymmetrized molecular dynamics and its application to 20Ne

A new theoretical framework is presented that uses a localized triaxially deformed Gaussian as the single-particle wave packet. The model space enables us to adequately describe both the deformed mean-field structure and the cluster structure within the same framework. The improvement over the original version of antisymmetrized molecular dynamics which uses the spherical Gaussian is verified by its application to the 20Ne nucleus. The coexistence and interplay of the cluster structure and the deformed mean-field structure in the low-excited states of 20Ne is studied. In particular, the intraband E2 transition probabilities in Kπ=01+ and 2- bands are reproduced without any effective charge