Parity reversion in ^{12}_ΛBe

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

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