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Spatial Distribution Measurements of Fission Neutrons in Water as an Oxygen Data Test

L. Green, J. J. Ullo

Nuclear Science and Engineering

Volume 67 / Number 2 / August 1978 / Pages 172-183


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The spatial distribution of the total neutron density from a 252Cf source in pure water was measured to high statistical precision at distances ranging from 11 to 80 cm from the source. Assuming the adequacy of the ENDF/B-IV hydrogen cross sections and reasonable constraints on the fission spectrum mean energy, good agreement between experiment and a one-dimensional transport calculation was obtained for both ENDF/B-III and -IV oxygen cross sections, with Version III being slightly better. However, small residual differences remained that could not be removed by adjustment of the spectrum mean energy alone.

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