Abstract
The thermal value of eta for U//sup 233/ and U//sup 235/ is determined in experiments on unreflected homogeneous aqueous solutions of the two isotopes. These experiments also yield a value for the neutron age and the limiting concentrations of the fissile isotope in the aqueous solutions for infinlte volumes. Auxiliary experiments, establishing limits of error, testing certain aspects of the theoretical model employed, and experimentally determining the parameters in the critical equation, are also performed. Experiments performed with 27-in.- and 48-in.-diam spheres, and 5-ft- and 9-ft-diam cylinders yield consistent values of eta. Measurements of the nonleakage probability in cylindrical geometry give values consistent with those predicted by a two-group model in which the theoretical value of the age is used. Within the experimental error no differences are found in the ages of fission neutrons for U/sup 233/ and U/sup 235/. The average thermal values of eta determined are 2.292 plus or minus 0.015 for U/sup 233/ and 2.076 plus or minus 0.015 for U//sup 235/. The 2200 meters/sec values are the same since the g-factors for eta are unity. The value of the neutron age to the indium resonance energy for U//sup 235/fission neutrons in water is found to bemore » 25.6 plus or minus 1.3 cm/sup 2/. The minimum U/sup 233/ and U/sup 235/ critical densities for these nitrate solutions are found to be 11.25 plus or minus 0.10 and 12.30 plus or minus 0.10 gm/liter for U/sup 233/ and U/sup 235/, respectively. (auth)« less
Published Version
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