SYSTEMATICS OF (N,2N) AND (N,3N) CROSS SECTIONSInstitute of Nuclear Science, Lanzhou University, Lanzhou, China Cai Dunjiu Institute of Atomic Energy, P.O. Box 275-41, Beijing, China The systematics of (n,2n) and (n,3n) cross sections has been studied by means of the evaporation model including the preequilibrium emission. A set of the empirical parameters have been extracted on the bases of analysing and fitting the measured data. The (n,2n) and (n,3n) cross sections of some nuclei have been predicted, and good agreement with the measured data have been obtained. KEYWORDS: systematics, evaporation, preequilibrium, (n,2n) and (n,3n) cross sections |