The intruder feature of 31Mg and the coexistence of many particle and many hole states
Abstract
The low-lying level structure of 31 Mg has been investigated by the antisymmetrized molecular dynamics (AMD) plus generator coordinate method (GCM) with the Gogny D1S force. It is shown that the N=20 magic number is broken and the ground state has the pure neutron 2p3h configuration. The coexistence of many particle and many hole states at very low excitation energy is discussed.
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