Role of Effective Distance in the Fission Mechanism Study by the Double-energy Measurement for Uranium Isotopes.

DOI Web Site 参考文献77件
  • BABA Hiroshi
    Department of Chemistry, Graduate School of Science, Osaka University
  • SAITO Tadashi
    Department of Chemistry, Graduate School of Science, Osaka University
  • TAKAHASHI Naruto
    Department of Chemistry, Graduate School of Science, Osaka University
  • YOKOYAMA Akihiko
    Department of Chemistry, Graduate School of Science, Osaka University
  • MIYAUCHI Takahiro
    Department of Chemistry, Graduate School of Science, Osaka University
  • MORI Sigehisa
    Department of Chemistry, Graduate School of Science, Osaka University
  • YANO Daisaku
    Department of Chemistry, Graduate School of Science, Osaka University
  • HAKODA Teruyuki
    Department of Chemistry, Graduate School of Science, Osaka University Present address: Japan Atomic Energy Research Institute,
  • TAKAMIYA Koichi
    Department of Chemistry, Graduate School of Science, Osaka University
  • NAKANISHI Kiyoshi
    Department of Chemistry, Graduate School of Science, Osaka University
  • NAKAGOME Yoshihiro
    Research Reactor Institute, Kyoto University

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  • Role of Effective Distance in the Fissi

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<BR>Fission product kinetic energies were measured by the double-energy method for thermal-neutron fission of 235, 233U and proton-induced fission of 238U at the 15.8-MeV excitation. From the obtained energy-mass correlation data, the kinetic-energy distribution was constructed from each mass bin to evaluate the first moment of the kinetic energy for a given fragment mass. The resulting kinetic energy was then converted to the effective distance between the charge centers at the moment of scission. The effective distances deduced for the proton-induced fission was concluded to be classified into two constant values, one for asymmetric and the other for symmetric mode, irrespective of the mass though an additional component was further extracted in the asymmetric mass region. This indicates that the fission takes place via two well-defined saddles, followed by the random neck rupture. On the contrary, the effective distances obtained for thermal-neutron induced fission turned out to lie along the contour line at the same level as the equilibrium deformation in the two-dimensional potential map. This strongly suggests that it is essentially a barrier-penetrating type of fission rather than the over-barrier fission.

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