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The competition between fusion-fission and deeply inelastic reactions in the medium mass systems

  • Heavy Ion Physics
  • Published:
Zeitschrift für Physik A Hadrons and Nuclei

Abstract

The competition between fusion-fission and deeply inelastic reactions in the Cl + Ni system has been studied by investigating the exit channelQ-value dependence of theZ-distributions of fission-like fragments. TheZ-, kinetic energy- and angular distributions of the fission-like fragments produced in the37Cl +64Ni system atE lab=170, 186 MeV and in the28Si +74Ge system atE lab=176 MeV have been measured by counter telescopes. TheZ-distribution of the37Cl +64Ni system was found to be essentially the same as that of the35Cl +62Ni system at the same bombarding energy. It is shown that this result can not be explained by the statistical fusion fission model but is consistent with a deeply inelastic model. A systematic study of the fission-like phenomenon in this mass region indicates that the maximum angular momenta for fusion reactions as well as the minimum angular momenta for DIC can be reproduced by the Bass model in the sliding limit (f=1.0) while the maximum angular momenta for fully energy-damped deeply inelastic reactions are governed by the strong interaction radius as predicted by the successive critical distance fusion model. The significance of these results are discussed.

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Author notes

  1. Y. H. Pu

    Present address: The Institute of Physical and Chemical Research (RIKEN), Japan

Authors and Affiliations

  1. Institute of Physics, University of Tsukuba, Tsukuba-shi, 305, Ibaraki, Japan

    Y. H. Pu, S. M. Lee, H. Fujiwara, T. Mizota & Y. Futami

  2. Institute for Nuclear Study (INS), University of Tokyo, Midori-cho 3-2-1, Tanashi-shi, 188, Tokyo, Japan

    S. C. Jeong

  3. The Institute of Physical and Chemical Research (RIKEN), Hirosawa 2-1, Wako-shi, 351-01, Saitama, Japan

    T. Nakagawa

  4. Japan Atomic Energy Research Institute (JAERI), Tokai-mura, Naka-kun, 319, Ibaraki, Japan

    H. Ikezoe & Y. Nagame

Authors
  1. Y. H. Pu
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  2. S. M. Lee
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  4. H. Fujiwara
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  5. T. Mizota
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  6. Y. Futami
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  7. T. Nakagawa
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  8. H. Ikezoe
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  9. Y. Nagame
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Additional information

Communicated by V. Metag

We would acknowledge gratefully useful discussions with Dr. T. Matsuse and express our thanks to the JAERI tandem accelerator facility crew for providing excellent beams for this experiment.

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Pu, Y.H., Lee, S.M., Jeong, S.C. et al. The competition between fusion-fission and deeply inelastic reactions in the medium mass systems. Z. Physik A - Hadrons and Nuclei 353, 387–396 (1996). https://doi.org/10.1007/BF01285150

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  • DOI: https://doi.org/10.1007/BF01285150

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