1979•University of North Texas Digital Library (University of North Texas)Open access
Evaluation of /sup 235/U(n,f) above 100 keV for ENDF/B-V and the implications of a unified /sup 235/U mass scale. [Above 100 keV]
Wolfgang P. Poenitz, J.W. Meadows, Roland J. Armani
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Abstract
A previously reported evaluation of /sup 235/U(n,f) in the fast neutron energy range was updated to include data published up to the 1978 Harwell Conference on Neutron Physics. The shape of the cross section resulting from this evaluation and a normalization factor extracted from data provided within the framework of this evaluation were used by the Subcommittee on Standards and Normalizations of the Cross Section Evaluation Working Group to establish /sup 235/U(n,f) for ENDF/B-V above 100 keV. The /sup 235/U sample mass comparisons made between different laboratories were compiled in order to investigate the implications of different sample masses on recent /sup 235/U(n,f) data. A new intercomparison of several such samples was carried out using absolute and relative alpha-counting and relative fast neutron fission counting. The result of this work is a unified /sup 235/U mass scale with an uncertainty of 0.6%. 39 references.
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