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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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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.

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Authors and Affiliations

  1. IPN Lyon, IN2P3/CNRS, Université Lyon-1, F-69622 Villeurbanne Cedex, France, , , , , , FR

    A. Prévost, N. Buforn, A. Astier, R. Duffait, M. Meyer, S. Perriès, N. Redon & O. Stézowski

  2. CSNSM Orsay, IN2P3/CNRS, Université Paris-Sud, F-91405 Orsay Campus, France, , , , , , FR

    A. Bauchet, I. Deloncle & M.G. Porquet

  3. Institut für Strahlen- und Kernphysik, Universität Bonn, Nussallee 14-16, D-53115 Bonn, Germany, , , , , , DE

    A. Görgen, H. Hübel, E. Mergel, S. Neumann, D. Roßbach, N. Nenoff & G. Schönwaßer

  4. Department of Physics, University of York, York Y01 5DD, United Kingdom, , , , , , GB

    A.N. Wilson

  5. CEA/Saclay, DAPNIA/SPhN, F-91191 Gif sur Yvette, France, , , , , , FR

    R. Lucas

  6. IReS Strasbourg, IN2P3/CNRS, Université Louis Pasteur, F-67037 Strasbourg Cedex 2, France, , , , , , FR

    F.A. Beck, D. Curien, G. Duchêne, B.J.P. Gall, N. Kintz & J.P. Vivien

  7. Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom, , , , , , GB

    D.M. Cullen

Authors
  1. A. Prévost
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  2. N. Buforn
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  3. A. Astier
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  4. R. Duffait
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  5. M. Meyer
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  6. S. Perriès
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  7. N. Redon
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  8. O. Stézowski
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  9. A. Bauchet
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  10. I. Deloncle
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  11. M.G. Porquet
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  12. A. Görgen
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  13. H. Hübel
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  14. E. Mergel
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  15. S. Neumann
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  16. D. Roßbach
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  17. N. Nenoff
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  18. G. Schönwaßer
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  19. A.N. Wilson
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  20. R. Lucas
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  21. F.A. Beck
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  22. D. Curien
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  23. G. Duchêne
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  24. B.J.P. Gall
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  25. N. Kintz
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  26. J.P. Vivien
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  27. D.M. Cullen
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Additional information

Received: 20 December 2000 / Accepted: 24 January 2001

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Prévost, A., Buforn, N., Astier, A. et al. New excited superdeformed bands in heavy Pb nuclei: Clue for an octupole softness near the N = 118 gap at large deformation. Eur Phys J A 10, 13–19 (2001). https://doi.org/10.1007/s100500170139

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  • DOI: https://doi.org/10.1007/s100500170139

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