Structure of excited states of11Bestudied with antisymmetrized molecular dynamics

The structures of the ground and excited states of ${}^{11}\mathrm{Be}$ were studied with a microscopic method of antisymmetrized molecular dynamics. The theoretical results reproduce the abnormal parity of the ground state and predict various kinds of excited states. We suggest a new negative-parity band with a well-developed cluster structure which reaches high-spin states. Focusing on a $2\alpha$ cluster structure, we investigated the structure of the ground and excited states. We point out that molecular orbits play important roles for the intruder ground state and the low-lying $2ħ\omega$ states. The features of the breaking of $\alpha$ clusters were also studied with the help of data for Gamow-Teller transitions.