FISSION FRAGMENT DISTRIBUTIONS IN RESOLVED RESONANCES OF 235(N,F)
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 range from 0.006 eV to 0.5 MeV was covered in a time-of-flight experiment at the Geel Electron Linear Accelerator (GELINA). 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 <TKE> with respect to the thermal value of up to sim450 keV are observed for resonances below 40 eV. The variations of <TKE> from resonance to resonance can be related to changes in the population of the three fission exit channels. Also the symmetric fission yields or valley-to-peak ratios of the mass distributions fluctuate from resonance to resonance up to a factor two. These fluctuations are not correlated with the resonance spin of the compound nucleus. An explanation for the fluctuations is proposed.
Bibliographic Reference: INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY, MITO (JAPAN), MAY, 30-JUNE, 3, 1988, AVAILABILITY: CEC-LUXEMBOURG, DG-XIII-C-3, POB 1907, MENTIONING PAPER EN 34060 ORA
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Record Number: 1989126105900 / Last updated on: 1989-06-01
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