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

Phys. Rev. Lett.

105
252501
(2010)
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

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.

DOI
10.1103/PhysRevLett.105.252501
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