Bimodal Nature of Low Energy Fission of Light Actinides

Y. Nagame, I. Nishinaka, K. Tsukada, S. Ichikawa, H. Ikezoe, Y. L. Zhao, Y. Oura, K. Sueki, H. Nakahara, M. Tanikawa, T. Ohtsuki, K. Takamiya, K. Nakanishi, H. Kudo, Y. Hamajima, Y. H. Chung

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Studies of mass division phenomena in low energy proton-induced fission of light actinides are discussed. From experimental data of excitation functions and angular distributions of fission products, it has been found that there are two kinds of fission threshold energies (fission barrier heights); symmetric and asymmetric mass divisions require different threshold energies. Two kinds of scission configurations for certain mass division have been verified by accurate measurements of fragment velocities: compact and elongated scission configurations. A correlation between the two types of threshold energies and the two kinds of scission configurations has been revealed by observing the incident energy dependence of the yields corresponding to each compact and elongated scission configuration. It indicates that there are two independent deformation paths in the protoninduced fission of light actinides; one type of the fission process has a lower threshold energy and leads to a compact scission configuration with reflection asymmetry, while the other type has a higher threshold energy and leads to a symmetric elongated scission configuration.

Original languageEnglish (US)
Pages (from-to)3-10
Number of pages8
JournalRadiochimica Acta
Issue number1
StatePublished - 1997


  • Light actinides
  • Proton-induced fission
  • Two deformation paths (bimodal nature)
  • Two kinds of fission barriers (threshold energies)
  • Two kinds of scission configurations

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Nuclear Energy and Engineering


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