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Measurement of the neutrons emitted in the proton-induced fission of sup 209 Bi and sup 238 U at 475 MeV

Journal Article · · Physical Review, C (Nuclear Physics); (USA)
; ; ;  [1]; ; ; ; ; ; ;  [2]
  1. Nuclear Physics Department, Weizmann Institute of Science, Rehovot 76100, Israel (IL)
  2. Physics Department, University of Alberta, Edmonton, Alberta, Canada T6G 2J1 (CA)
We have measured the number of prefission and postfission neutrons emitted in the fission of {sup 209}Bi and {sup 238}U targets bombarded with 475 MeV protons as a function of the total kinetic energy of the two fission fragments, the fission fragment mass, and the recoil velocity of the excited nucleus prior to fission. The average number of prefission neutrons is approximately equal to the average number of postfission neutrons for both targets and the total number equals {similar to}17. The number of prefission neutrons increases with increasing recoil velocity and their average number is substantially larger than that predicted by the Bohr-Wheeler theory.
OSTI ID:
6915377
Journal Information:
Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 41:3; ISSN 0556-2813; ISSN PRVCA
Country of Publication:
United States
Language:
English

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