Fast neutron fission of 240Pu

We have measured the mass-yield distribution from the fission of 240Pu induced by fast neutrons from a plutonium metal critical assembly. Measurements were made for 44 fission products from 72Zn to 169Er, from which we calculated total chain yields for 36 mass numbers and constructed a mass-yield curve. Absolute fission yields were obtained with an accuracy of about 5% by using the 235U (n,f) monitor reaction and by the requirement of unit total yield in each half of the mass-yield distribution. The peak-to-valley ratio is about 150. Several independent fission yields were measured and Z/sub p/ values inferred from these measurements are in good agreement with those estimated from independent-yield systematics