Post-neutron mass yield distribution in the epi-cadmium neutron induced fission of 99.9997 atom % 238U

Abstract The cumulative yields of various short and relative long-lived fission products within the mass range of 80–115 and 123–157 have been measured in the epi-cadmium neutron induced fission of 99.9997 atom % 238U, by using an off-line γ-ray spectrometric technique. The mass chain yields were obtained from the cumulative yields by applying the charge distribution correction. The present and earlier data in the 238U(n, f) reaction was compared with the similar data of 232Th(n, f) reaction. In the 38U(n, f) reaction, the yields around the mass range 134–138 and their complementary are higher than the other fission products, which indicate the favorable standard I asymmetric mode of fission. On the other hand, in the 232Th(n, f) reaction, the yields around 139–144 and their complementary are higher than the other fission products, which indicate the favorable standard II asymmetric mode of fission.