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Low-Flux Measurement of 235U Epicadmium Capture-to-Fission Ratio

W. C. Redman, M. M. Bretscher

Nuclear Science and Engineering / Volume 31 / Number 2 / February 1968 / Pages 247-253

Technical Paper / dx.doi.org/10.13182/NSE68-A18237

A combination of relative reactivity measurements and absolute counting techniques has been applied to determine the epicadmium capture-to-fission ratio for 235U. Significant features of this procedure are its requirement of only a moderate neutron flux, the application of 252Cf and manganese to measure the relative importance of fission and absorbed neutrons, and the use of methods that differ from those applied in the high fluence procedures for α measurements. The resulting value of 0.519 ± 0.023, for infinite sample dilution, l/E spectrum, and 0.5-eV low-energy cutoff, is in good agreement with recent results from high fluence irradiations and differential cross-section data.