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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 MG Porquet A Görgen H Hübel E Mergel S Neumann D Roßbach N Nenoff G Schönwaßer AN Wilson R Lucas FA Beck D Curien G Duchêne BJP Gall N Kintz JP Vivien DM Cullen |
| Institution: | 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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