FISSION MODES IN 235N,T
Fission fragment energies and emission angles with respect to the incident neutron beam were measured for "235"(n,f) using a twin Frisch gridded ionization chamber. The neutron energy ranges from thermal to 0.5 MeV and from 0.5 MeV to 6 MeV were covered in experiments at the Geel Electron Linear Accelerator (GELINA) and at the 7 MeV Van de Graaff, respectively. The experimental set-up will be briefly described. Fission fragment mass and total kinetic energy distributions were evaluated for thermal neutrons, for resolved resonances below 40 eV, and in certain energy bins at higher neutron energy. Fluctuations in the average total kinetic energy with respect to the thermal value of up to sim 450 KeV were observed for the resolved resonances below 40 eV. Recently Brosa "it et al/". predicted on theoretical grounds the existence of three fission channels for "235"(n,f). An analysis of the fragment mass yield, the average total kinetic energy versus fragment mass, and the variance of TKE as a function of mass for thermal neutron induced fission of "235" supports this three- channel fission model. The variation of (TKE) from resonance to resonance can be related to changes in the population of the three fission modes.
Bibliographic Reference: INTERNATIONAL CONFERENCE ON NEUTRON PHYSICS, KIEV, USSR, SEPT. 21-25, 1987, AVAILABILITY: CEC-LUXEMBOURG, DG XIII/A2, BP 1907, MENTIONING PAPER ORA 33825 E
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Record Number: 1989126071300 / Last updated on: 1989-05-01
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