COMPARATIVE ANALYSIS OF ALGORITHMS FOR REPRESENTING A SCATTERING INDICATRIX IN THE PROBABILISTIC METHOD OF DISCRETE ORDINATES

摘要

The form of the collision integral in the equations of the probabilistic method of discrete ordinates is examined. Two algorithms for calculating double differential energy-angle sections based on evaluated nuclear data are described. In the first (physical) algorithm, the sections are calculated, according to the law of elastic scattering, by the method of local integration of a 8 function, and in the second the sections are reconstructed according to the moments of the scattering matrix. The advantages of the algorithms in the calculation of different functionals in problems with an external neutron source are analyzed. The computational results for a system with a source of 14 MeV neutrons are presented. The algorithms are compared from the standpoint of the correct scattering description by means of a finite number of moments of transfer cross sections.