Evaluation of the (n,2n), (n,3n) reaction cross sections on heavy nuclei with account for nonequilibrium processes

A method for evaluation of the (n, 2n), (n, 3n) excitation functions on heavy nuclei has been done in the initial neutron energy range up to the (n, 4n)-reaction threshold. Formulas are given for the absolute cross-sections calculation variants of the statistical and exciton models. The fission channel is described by the systematics of experimental values of neutron and fission widths GITAsub(n)/GITAsub(f). An evalution of the (n, 2n) and (n, 3n) reaction cross-sections has been done for 20 fissile isotopes. The results have been compared with other evaluations