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American Physical Society, Physical Review Letters, 25(105)

DOI: 10.1103/physrevlett.105.252501

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Discovery of the Shape Coexisting0+State inMg32by a Two Neutron Transfer Reaction

Journal article published in 2010 by K. Wimmer, T. Kröll, R. Krücken, V. Bildstein, R. Gernhäuser, B. Bastin, N. Bree, J. Diriken, P. Van Duppen, M. Huyse, N. Patronis, P. Vermaelen, D. Voulot, J. Van de Walle, F. Wenander and other authors.
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This paper is available in a repository.

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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 0þ state in 32Mg has been identified by the characteristic angular distribution of the protons of the L ¼ 0 transfer. The excitation energy of 1058 keV is much lower than predicted by any theoretical model. The low -ray intensity observed for the decay of this 0þ state indicates a lifetime of more than 10 ns. Deduced spectroscopic amplitudes are compared with occupation numbers from shell-model calculations.