Discovery of the Shape Coexisting 0+ State in 32Mg by a Two Neutron Transfer Reaction

The “island of inversion” nucleus
32
Mg
has been studied by a (𝑡, 𝑝) two neutron transfer reaction in inverse kinematics at REX-ISOLDE. The shape coexistent excited 0+ state in
32
Mg
has been identified by the characteristic angular distribution of the protons of the 𝛥⁢𝐿 =0 transfer. The excitation energy of 1058 keV is much lower than predicted by any theoretical model. The low 𝛾-ray intensity observed for the decay of this 0+ state indicates a lifetime of more than 10 ns. Deduced spectroscopic amplitudes are compared with occupation numbers from shell-model calculations.

Authors: 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, L. M. Fraile, R. Chapman, B. Hadinia, R. Orlandi, J. F. Smith, R. Lutter, P. G. Thirolf, M. Labiche, A. Blazhev, M. Kalkühler, P. Reiter, M. Seidlitz, N. Warr, A. O. Macchiavelli, H. B. Jeppesen, E. Fiori, G. Georgiev, G. Schrieder, S. Das Gupta, G. Lo Bianco, S. Nardelli, J. Butterworth, J. Johansen, and K. Riisager

Doi: 10.1103/PhysRevLett.105.252501

Issue number:

Journal: Phys. Rev. Lett.

Page number: 252501

Published on: 2010-12-13

Year: