Fragment mass and kinetic energy distribution in isomeric fission of 240Pu

Abstract

Fragment mass and kinetic energy distributions have been measured for isomeric fission of 240Pu. The mass distribution is asymmetric with the average heavy fragment mass nearly equal to that found for ground state spontaneous fission of 240Pu, but slightly lower than for n th + 239Pu-fission. The average total fragment kinetic energy appears to be higher in isomeric fission (179.5 −0.7 +1.5 MeV) than in spontaneous fission from the ground state (176.8 ± 1.8 MeV).