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1 CSNSM SNO CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière : UMR8609 2 CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse 3 IPHC - Institut Pluridisciplinaire Hubert Curien 4 IPNO - Institut de Physique Nucléaire d-Orsay 5 IRFU - Institut de Recherches sur les lois Fondamentales de l-Univers 6 IIT, Roorkee 7 IPNL - Institut de Physique Nucléaire de Lyon

Abstract : Odd-odd 136Cs nuclei have been produced in the 18O + 208Pb and 12C + 238U fusion-fission reactions and their gamma rays studied with the Euroball array. The high-spin level scheme has been built up to ~ 4.7~MeV excitation energy and spin I ~ 16 hbar from the triple gamma-ray coincidence data. The configurations of the three structures observed above ~ 2 MeV excitation energy are first discussed by analogy with the proton excitations identified in the semi-magic 137Cs nucleus, which involve the three high-j orbits lying above the Z=50 gap, pi g {7-2}, pi d {5-2} and pi h {11-2}. This is confirmed by the results of shell-model calculations performed in this work.

Author: A. Astier - M.-G. Porquet - G. Duchene - F. Azaiez - D. Curien - I. Deloncle - O. Dorvaux - B.J.P. Gall - M. Houry - R. Lucas - P

Source: https://hal.archives-ouvertes.fr/


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