Paper detail

Impurity effects of $Λ$ particle on the 2$α$ cluster states of $^{9}$Be and $^{10}$Be

The low-lying structure of $^{10}_Λ$Be and $^{11}_Λ$Be are investigated within the framework of the antisymmetrized molecular dynamics. We focus on the modifications of the excitation spectra and dynamical changes of the 2$α$ cluster structure caused by a $Λ$ particle as an impurity in these hypernuclei. It is found that the excitation energies of well-pronounced cluster states are largely shifted up by the addition of a $Λ$ particle. Furthermore, we also find that the 2$α$ cluster structure is significantly changed in the excited states, whereas it is almost unchanged in the ground states.