ENERGY PARTITION IN 235U FISSION REACTION INDUCED BY THERMAL NEUTRON

The partition of the total excitation energy between the fission fragments for the nth + U-235 and n(E-n = 5.55 MeV) + U-235 fission reactions are analyzed with the experimental data available. Our results show that the total excitation energy is not shared by the fragments in proportion of their masses but support the so-called energy sorting-mechanism. The temperature of the heavy fragment is generally lower than that of the light one when the shell effect does not play a strong role. As soon as the mass of heavy fragment closes to 132, its temperature becomes higher than the complementary light one because of strong shell effect. Our results also show that the heavy fragments gain more energy than the complementary light ones when the incident neutron energy increases.