Influence of the angular momentum on nuclear fission

The effects of the angular momentum on the mechanism of nuclear fission are studied about the reaction systems of compound nucleus of 210P and 239Np by the time-of-flight (TOF) method. The reaction systems in this work are 209Bi+P, 206Pb+α, 206Po+α, 198Pt+12C, 238U+P and 232Th+7Li. Target was prepared by vacuum evaporating of each about 100 μg/cm2 of 209Bi, 206Pb and 198Pt on 10 μg/cm2 of carbon film. On compound nucleus 210Po, 210Po fissions at Ex=45McV but it fissions after 1 or 2 neutrons emission at higher excited energy (Ex=57 MeV). TKE shows almost the same values except higher value of 209Bi+P. The decreasing tendency of width of TKE distribution with increasing the angular momentum is found at the first time in this work. The effect of the angular momentum on the fission is small in the case of low angular momentum. On the compound nucleus 239Np, the effects are shown at the asymmetric fission part of the mass distribution. (S.Y.)