Discovery of the shape coexisting 0_s16 state in 32Mg by a two neutron transfer reaction
Wimmer, K. and others
Keywords
exotic nuclei, shell modification, Island of Inversion, shape coexistence, transfer reactions
Abstract
The Island of Inversion nucleus 32Mg has been studied by a (t,p) two neutron transfer reaction in inverse kinematics at REX-ISOLDE. The shape coexistent excited 0_s16 state in 32Mg has been identified by the characteristic angular distribution of the protons of the DeltaL = 0 transfer. The excitation energy of 1058 keV is much lower than predicted by any theoretical model. The low gamma-ray intensity observed for the decay of this 0_s16 state indicates a lifetime of more than 10 ns. Deduced spectroscopic amplitudes are compared with occupation numbers from shell model calculations.
