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Discovery of the shape coexisting 0+ state in 32Mg by a two neutron transfer reaction

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arxiv 1010.3999 v1 pith:PI3JPSSR submitted 2010-10-19 nucl-ex

K. Wimmer , T. Kröll , R. Krücken , V. Bildstein , R. Gernhäuser , B. Bastin , N. Bree , J. Diriken
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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 K. Riisager
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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+ 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+ state indicates a lifetime of more than 10 ns. Deduced spectroscopic amplitudes are compared with occupation numbers from shell model calculations.

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