High-spin structures of 136Cs

A. Astier (1) , M.-G. Porquet (2) , G. Duchene (3) , F. Azaiez (4) , D. Curien (3) , I. Deloncle (1) , O. Dorvaux (3) , B.J.P. Gall (3) , M. Houry (5) , R. Lucas (5) , P.C. Srivastava (6) , N. Redon (7) , Marc Rousseau (3) , O. Stezowski (7) , Ch. Theisen (5)

1 CSNSM SNO
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 - Indian Institute of Technology Roorkee
7 IPNL - Institut de Physique Nucléaire de Lyon

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.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

A. Astier, M.-G. Porquet, G. Duchene, F. Azaiez, D. Curien, et al.. High-spin structures of 136Cs. Physical Review C, 2013, 87 (05), pp.054316. ⟨10.1103/PhysRevC.87.054316⟩. ⟨hal-00823348⟩