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New excited superdeformed bands in heavy Pb nuclei: Clue for an octupole softness near the N = 118 gap at large deformation |
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| Authors: | A. Prévost N. Buforn A. Astier R. Duffait M. Meyer S. Perriès N. Redon O. Stézowski A. Bauchet I. Deloncle M.G. Porquet A. Görgen H. Hübel E. Mergel S. Neumann D. Roßbach N. Nenoff G. Schönwaßer A.N. Wilson R. Lucas F.A. Beck D. Curien G. Duchêne B.J.P. Gall N. Kintz J.P. Vivien D.M. Cullen |
| Affiliation: | IPN Lyon, IN2P3/CNRS, Université Lyon-1, F-69622 Villeurbanne Cedex, France, FR CSNSM Orsay, IN2P3/CNRS, Université Paris-Sud, F-91405 Orsay Campus, France, FR Institut für Strahlen- und Kernphysik, Universit?t Bonn, Nussallee 14-16, D-53115 Bonn, Germany, DE Department of Physics, University of York, York Y01 5DD, United Kingdom, GB CEA/Saclay, DAPNIA/SPhN, F-91191 Gif sur Yvette, France, FR IReS Strasbourg, IN2P3/CNRS, Université Louis Pasteur, F-67037 Strasbourg Cedex 2, France, FR Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom, GB |
| Abstract: | We report the identification of six new superdeformed (SD) bands in 197,198Pb observed with the EUROBALL IV spectrometer. The results are interpreted in the framework of cranked Hartree-Fock calculations with approximate projection on the particle number by means of the Lipkin-Nogami method. A mixing between quasi-particle excitations and an octupole vibration is suggested in the two SD isotopes. We have estimated the ordering of the neutron valence orbitals and confirm indirectly a N = 118 SD gap. Received: 20 December 2000 / Accepted: 24 January 2001 |
| Keywords: | PACS. 21.10.Re Collective levels – 21.60.Ev Collective models – 23.20.Lv Gamma transitions and level energies – 27.80.+w 190 ?A? 219 |
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