New experimental and theoretical results for the 235U fission neutron spectrumN.V. Kornilov1, F.-J. Hambsch1, I. Fabry1, S. Oberstedt1 and S.P. Simakov2
1 EC-JRC-IRMM, 2440 Geel, Belgium
2 Forschungszentrum Karlsruhe, Institute für Reaktorsicherheit, 76344 Eggenstein-Leopoldshafen, Germany
Published online: 21 May 2008
The prompt fission neutron spectrum (PFNS) was measured at 0.5 MeV incident neutron energy. An angular anisotropy in the prompt neutron emission was found. The neutron yield is ~10% higher and the average energy ~80 keV smaller at 90 degree than at 120 degree neutron emission angle. The spectral difference diminishes with increasing prompt neutron energy. The experimental data were successfully described with the semi-empirical "three sources" model.
© CEA 2008