Cluster Structures of the Ground and Excited States of 12Be Studied with Antisymmetrized Molecular Dynamics

Yoshiko Kanada-En'yo, Hisashi Horiuchi

Published 2003-01-21, updated 2003-04-28Version 2

The structures of the ground and excited states of 12Be were studied with antisymmetrized molecular dynamics. The ground state was found to be a state with a developed 2-alpha core with two neutrons occupying the intruder orbits. The energy levels of the newly measured spin-assigned states were described well, except for the $1^-_1$ state. The calculations indicated that many exotic cluster structures appear in the low-energy region. The widths concerning alpha and 6He decays were discussed by using reduced width amplitudes.