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Evidence for a two-phonon octupole vibrational state in208Pb

  • Neuclear Structure and Reactions
  • Published:
Zeitschrift für Physik A Hadrons and Nuclei

Abstract

Collective properties of206,208Pb have been investigated with gamma-ray spectroscopy using nuclear and electromagnetic excitation by208Pb projectiles. From the measurement of particle-particle-γ and particle-particle-γ γ coincidences a new energy level in208Pb at 5.683 MeV was observed and the data suggest an interpretation as a 2-phonon octupole vibrational state with spin 4+ or 6+. For this state one finds the same dynamical deformation parameterβ 3 as for the first-excited collective 3− state. The results are compared to predictions of models which consider, in particular, the aspects of the quadrupole interaction and the interaction of the 2-particle pairing vibration with the 2-phonon octupole vibration. For the206Pb+208Pb system at 6.2 MeV/u the nuclear potential could be determined from the measured inelastic cross sections.

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Authors and Affiliations

  1. Gesellschaft für Schwerionenforschung, W-6100, Darmstadt, Federal Republic of Germany

    H. J. Wollersheim, P. Egelhof, H. Emling, J. Gerl, W. Henning, R. Holzmann, R. Schmidt & R. S. Simon

  2. Institut für Kernphysik, Universität Frankfurt, W-6000, Frankfurt am Main, Federal Republic of Germany

    N. Martin, G. Eckert, Th. W. Elze & K. Stelzer

  3. Institute of Physics, Jagiellonian University, Krakow, Poland

    R. Kulessa

  4. Centre de Recherches Nucléaires, Strasbourg, France

    G. Duchene, B. Haas, J. C. Merdinger & J. P. Vivien

  5. Sektion Physik, Ludwig-Maximilians-Universität, W-8000, München, Federal Republic of Germany

    J. de Boer, E. Hauber & K. Kaiser

  6. Institut für Kernphysik, Universität Köln, W-5000, Köln, Federal Republic of Germany

    P. von Brentano, R. Reinhardt & R. Wirowski

  7. Department of Physics, University of Jyväskylä, Jyväskylä, Finland

    R. Julin

  8. The Svedberg Laboratory, Uppsala University, Uppsala, Sweden

    C. Fahlander & I. Thorslund

  9. Hahn-Meitner-Institut, W-1000, Berlin, Federal Republic of Germany

    H. Kluge

Authors
  1. H. J. Wollersheim
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  2. P. Egelhof
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  3. H. Emling
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  4. J. Gerl
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  5. W. Henning
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  6. R. Holzmann
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  7. R. Schmidt
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  8. R. S. Simon
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  9. N. Martin
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  10. G. Eckert
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  11. Th. W. Elze
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  12. K. Stelzer
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  13. R. Kulessa
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  14. G. Duchene
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  15. B. Haas
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  16. J. C. Merdinger
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  17. J. P. Vivien
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  18. J. de Boer
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  19. E. Hauber
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  20. K. Kaiser
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  21. P. von Brentano
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  22. R. Reinhardt
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  23. R. Wirowski
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  24. R. Julin
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  25. C. Fahlander
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  27. H. Kluge
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Additional information

Dedicated to Prof. Dr. P. Kienle on the occasion of his 60th birthday

We thank J. Blomqvist for many valuable discussions. We also appreciate the support by H. Folger of the GSI target laboratory for preparing the Pb-targets. Thanks are also due to the operating staff of the UNILAC for supplying the high-quality Pb beam.

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Wollersheim, H.J., Egelhof, P., Emling, H. et al. Evidence for a two-phonon octupole vibrational state in208Pb. Z. Physik A - Hadrons and Nuclei 341, 137–144 (1992). https://doi.org/10.1007/BF01298473

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  • DOI: https://doi.org/10.1007/BF01298473

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