INTERPRETATION OF FLUCTATIONS OF NU AND E-GAMMA IN RESONANCES OF 235-(N,F)
Fluctations of nu and Egamma in resonances of "235"(n,f) were measured in earlier experiments. Recently fission fragment mass- and total kinetic energy distributions of "235"(n,f) were determined for single isolated resonances, resonance groups and energy bins in the energy range from 0.006 eV to 140 eV in an experiment at GELINA. Fluctuations of the symmetric fission fragment yield and of the asymmetric fragment peak shapes were observed. These fluctuations are interpreted by fluctuations of fission exit channel populations: by the superlong symmetric and the two asymmetric standard I and standard II exit channel populations. Mainly the fluctuations in the standard I and the standard II exit channels cause variations in the average reaction <Q>E-"rm i"-values. Correlated with the fluctuations of the mass yields in the asymmetric mass peaks also strong fluctuations of the total kinetic energy averaged over all fragments <TKE>E_"rm i" are observed, which are anti- correlated with nuE-"rm i", the number of promptly emitted neutrons. It is explained, contrary to earlier assumptions, why the asymmetric and not the symmetric fission fragment yield fluctuations cause the fluctuations in nu and Egamma from resonance to resonance. It can also be concluded that the nu- fluctuations are not J-dependent.
Bibliographic Reference: CONSULTANTS MEETING OF THE PHYSICS OF NEUTRON EMISSION IN FISSION, MITO/JAPAN, MAY 24-27, 1988, AVAILABILITY: CEC-LUXEMBOURG, DG-XIII/A2, BP 1907, MENTIONING PAPER ORA 33922 E
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Record Number: 1989126095700 / Last updated on: 1989-05-01
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