Abstract
The neutron energy spectrum at the center of the dilute fast core of the coupled fast-thermal reactor ZPR-V was studied by use of fission chambers having electrodes quantitatively electrodeposited with U/sup 234/, U/sup 235/, U/sup 236/ and U/sup 238/ Atomic fission ratios found with these four isotopes determine a four-group neutron energy spectrum which can readily be measured as a function of position in the core by use of suitable drive units. The same fission chamber procedure was used to study the equilibrium neutron energy spectrum in a nataral uranium exponential column at Los Alamos. The results of meesurements in these two spectra are shown and compared with theoretical predictions. The ZPR-V results are also compared to an analysis of this spectrum made by use of nuclear emulsions for the range 0.2 to 2.2 Mev. (auth)
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