Radiochemical study of sub-barrier fusion hindrance in the 19F+209Bi reaction

I. Nishinaka 1 , Y. Kasamatsu 2 , M. Tanikawa 3 , S. Goto 4 , and M. Asai 5
  • 1  Japan Atomic Energy Research Institute, Advanced Science Research Centre, Tokai, Ibaraki 319-1195, Japan
  • 2  Japan Atmoic Energy Agency, Advanced Science Research Centre, Tokai, Ibaraki 319-1195, Japan
  • 3  Japan
  • 4  Niigata University, Department of Chemistry, Niigata 950-2181, Japan
  • 5  Japan Atomic Energy Research Institute, Advanced Science Research Centre, Tokai, Ibaraki 319-1195, Japan

Abstract

Production cross sections of fission product 99Mo produced in the reaction of 19F + 209Bi have been measured at the incident energies 135–83 MeV near and below the fusion barrier by radiochemical methods. The excitation function for the fusion-fission cross sections in this reaction were deduced down to 80 μb from the measured production cross sections. A systematic analysis of the fusion-fission excitation function shows that sub-barrier fusion hindrance in the heavy mass system 19F + 209Bi is different from that in the medium-heavy mass systems but similar to that in the medium-light mass system and in the heavy mass system. This work is the first radiochemical study of sub-barrier fusion hindrance in heavy mass systems.

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