Systematics of (n,2n) and (n,3n) reaction cross sections

Analyses of (n,2n) and (n,3n) cross sections are based on the compound decay, the preequilibrium emission and the direct reaction model. The results indicate that it is necessary to consider the odd even effect of neutron numbers in (n,2n) and (n,3n) cross sections. The (n,2n) and (n,3n) cross sections of many nuclides have been predicted and a good agreement with the measured data has been obtained. (author)