Parity reversion in ^{12}_\Lambda Be

Abstract

The spectrum of ${}_{\Lambda }^{12}$Be is studied by an extended version of antisymmetrized molecular dynamics for hypernuclei. The result predicts the positive-parity ground state of ${}_{\Lambda }^{12}$Be that is reverted to the normal one by the impurity effect of $\Lambda$ particle. The reversion of the parity is due to the difference of $\Lambda$ binding energy in the positive- and negative-parity states that originates in the difference of $\alpha$ clustering and deformation.

Comments: 3 figures