2α + t Cluster Structure in 11B

Abstract

Structures of excited states in 11B are investigated with a method of β – γ constraint antisymmetrized molecular dynamics in combination with the generator coordinate method. Various cluster structures are suggested in excited states. For negative-parity states, we suggest a band with a 2α + t cluster structure. This band starts from the \({3/2^{-}_{3}}\) state and can correspond to the experimental band observed recently. We find that the feature of the \({3/2^{-}_{3}}\) is quite similar to the \({0^{+}_{2}}\) state in 12C.