The Statistical Distribution Approach to Calculation of Nuclear Data

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H.L. Pai
D.G. Andrews

Abstract

There is a continuing need for reliable neutron cross sections up to the GeV level. Empirical cross sections are still needed below 20 MeV and are very rare above 20 MeV. The present study makes use of the statistical distribution of the daughter nuclei, either Boltzmann or Gaussian, in order to calculate cross sections. For the Boltzmann distribution, examples are cited for: (a) spontaneous fission of actinides (i.e., 0 MeV); (b) 14 MeV (n, 2n), (n,p) and (n,α) cross sections; (c) 14 - 100 MeV (n,xn) cross sections. The Gaussian distribution is illustrated by examples for: (a) yield of fission fragments before neutron emission; (b) estimation of spallation yields. If one benchmark cross section of a series has been accurately determined, then the rest will follow. Important contributions to compilation of the Evaluated Nuclear Data File (ENDF) are anticipated.

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