Comparison of measured and calculated reaction rates from D2O-moderated 252Cf neutrons

Activation detectors and an N.B.S. fission chamber have been used to measure reaction rates at several distances between 25 cm and 150 cm from the D2O-moderated 252Cf source at the University of Arkansas. The reactions measured were 197Au(n,γ), 115In(n,n'), 32S(n,p), 58Ni(n,p), 235U(n,f) and 237Np(n,f). Corrections for room-scatter, for air-scattering and for non-1/r2 effects near the source were applied to obtain the expected free-field reaction rates. Cross-sections from the ENDF/B V file and the D2O-moderated source spectrum from the Monte Carlo calculation of H. Ing and W. G. Cross were used to calculate reaction rates which are compared with the measured results. (Auth.)