中文摘要：

The prompt fission neutron spectra for the neutron-induced fission of 233U for low energy neutrons（below6 MeV） are calculated using nuclear evaporation theory with a semi-empirical method,in which the partition of the total excitation energy between the fission fragments for the nth+233U fission reactions is determined by the available experimental and evaluation data.The calculated prompt fission neutron spectra agree well with the experimental data.The proportions of high-energy neutrons of prompt fission neutron spectrum versus incident neutron energies are investigated with the theoretical spectra,and the results are consistent with the systematics.The semi-empirical method could be a useful tool for the prompt evaluation of fission neutron spectra.

英文摘要：

The prompt fission neutron spectra for the neutron-induced fission of 233U for low energy neutrons （below 6 MeV） are calculated using nuclear evaporation theory with a semi-empirical method, in which the partition of the total excitation energy between the fission fragments for the nth＋233U fission reactions is determined by the available experimental and evaluation data. The calculated prompt fission neutron spectra agree well with the experimental data. The proportions of high-energy neutrons of prompt fission neutron spectrum versus incident neutron energies are investigated with the theoretical spectra, and the results are consistent with the systematics. The semi-empirical method could be a useful tool for the prompt evaluation of fission neutron spectra.