Abstract
Certain conflicts arising from previous measurements of neutron flux parameters in the equilibrium spectrum of natural uranium have been resolved. The parameters which were investigated are listed below along with “best” values as measured in this work.The experiment was performed at the Pajarito critical assemblies facility utilizing two exponential columns of natural uranium, each 30.7 in. high, having diameters of 15 and 21 in. and excited by a small fast reactor. The system was outdoors, elevated some 11 ft above the ground level to reduce flux perturbations due to backscattering of neutrons. Perturbation corrected measurements in both columns made by several detection methods and with various source spectra agree to within experimental error and are consistent with calculated values.
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