Mass distribution in the fission of /sup 232/Th by degraded-fission-spectrum neutrons

The mass-yield distribution of fission products following degraded-fission-spectrum neutron-induced fission of /sup 232/Th was measured by gamma spectrometry for 25 mass chains including mass 138 for the first time for fast fission. Cumulative yields for /sup 83g/Se and /sup 130g/Sb were observed, the latter also for the first time for fast fission. In general, the yields for degraded-fission-spectrum neutron-induced fission of /sup 232/Th were slightly higher in the inner portions of both the heavy and light mass wings than for those from reactor-neutron-induced fission of /sup 232/Th. This was expected, since the average energy of degraded-fission-spectrum neutrons is slightly above that of reactor neutrons