DEPENDENCE OF NEUTRON EMISSION SPECTRA ON THE EXCITATION ENERGY OF SPONTANEOUS FISSION FRAGMENTS
V.G. Khlopin Radium Institute, Leningrad, USSR
Multiparameter precision measurements of differential energy spectra of 252Cf spontaneous fission neutrons have been carried out for different masses, kinetic energies and exitation energies of the fragments at different emission angles. These data have been analyzed on the assumption of the evaporation model. The dependence of the average neutron energies have been studied for different masses and the fragments total kinetic energies. Average energies of the neutrons emitted by spontaneous fission fragments have been compared with those of the neutrons from nuclear reactions.
KEYWORDS: fission, 252Cf, prompt fission neutrons, fragments mass and kinetic energy