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European Physical Journal A 34 (2007) 349-353
New high-spin states of $^{142}_ {58}$Ce and $^{140}_{56}$Ba from fusion-fission reactions: Proton excitations in the N = 84 isotones
T. Venkova1, 2, M.-G. Porquet1, I. Deloncle1, P. Petkov1, 2, A. Astier1, A. Prevost1, F. Azaiez3, A. Bogachev4, A. Buta3, D. Curien3, O. Dorvaux3, G. Duchene3, J. Durell5, B.J.P. Gall3, M. Houry6, F. Khalfallah3, R. Lucas6, M. Meyer7, I. Piqueras3, N. Redon7, A. Roach5, M. Rousseau3, O. Stezowski7, C. Theisen6

High-spin states in the $^{142}$Ce and $^{140}$Ba nuclei have been populated in the $^{12}$C + $^{238}$U and $^{18}$O + $^{208}$Pb fusion-fission reactions at 90 MeV and 85 MeV bombarding energy, respectively. The emitted $\gamma$-radiation was detected using the Euroball III and IV arrays. The high-spin yrast and near-to-yrast structures of $^{142}$Ce have been considerably extended. The level scheme of $^{140}$Ba has been extended by six new levels. The newly observed structures in these N = 84 isotones are discussed by analogy with the neighbouring nuclei.
1 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
2 :  Institute of Nuclear Research and Nuclear Energy
3 :  DRS-IPHC - Département Recherches Subatomiques
4 :  JINR
5 :  Department of Physics and Astronomy
6 :  SPhN - Service de Physique Nucléaire
7 :  IPNL - Institut de Physique Nucléaire de Lyon
Physique/Physique Nucléaire Expérimentale
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