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Physical Review C 85 (2012) 064316
High-spin structures of five N=82 isotones: 136Xe, 137Cs, 138Ba, 139La, and 140Ce
A. Astier1, M. -G. Porquet1, Ts. Venkova1, D. Verney2, Ch. Theisen3, G. Duchene4, F. Azaiez2, G. Barreau5, D. Curien4, I. Deloncle1, O. Dorvaux4, B. J. P. Gall4, M. Houry3, R. Lucas3, N. Redon6, M. Rousseau4, O. Stezowski6

Five N=82 isotones have been produced in two fusion-fission reactions and their gamma-rays studied with the Euroball array. The high-spin states of 139La have been identified for the first time, while the high-spin yrast and near-to-yrast structures of the four others have been greatly extended. From angular correlation analysis,spin values have been assigned to some states of 136Xe and 137Cs. Several cascades involving gamma-rays of 139La have been found to be delayed, they deexcite an isomeric state with T1/2= 315(35) ns located at 1800-keV excitation energy. The excited states of these five N=82 isotones are expected to be due to various proton excitations involving the three high-j subshells located above the Z=50 shell closure. This is confirmed by the results of shell-model calculations performed in this work. In addition, high-spin states corresponding to the excitation of the neutron core have been unambiguously identified in 136Xe, 137Cs, and 138Ba.
1 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
2 :  IPNO - Institut de Physique Nucléaire d'Orsay
3 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
4 :  IPHC - Institut Pluridisciplinaire Hubert Curien
5 :  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
6 :  IPNL - Institut de Physique Nucléaire de Lyon
Physique/Physique Nucléaire Expérimentale

Physique/Physique Nucléaire Théorique
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