Large deformation of the very neutron-rich nucleus 32Mg from intermediate-energy Coulomb excitation

https://doi.org/10.1016/0370-2693(95)00012-AGet rights and content

Abstract

The Coulomb excitation of a very neutron-rich nucleus 32Mg to its 2+ state was studied using an unstable nuclear beam of 32Mg at 49.2 MeV/u with a 208Pb target. The B(E2) value of 454±78 e2fm4 was extracted by a coupled channel analysis. The value is in good agreement with recent predictions. It confirms a large deformation for 32Mg suggested by the low excitation energy of the 2+ state, and points to the vanishing of the N = 20 shell gap.

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