Measurement of the Energy Dependence of Prompt Fission Neutron Emission from sup 233 U, sup 235 U, and sup 239 Pu for E = 0.0005 to 10 MeV Relative to Emission from Spontaneous Fission of sup 252 Cf

摘要

A series of experiments has been performed to measure the dependence on the incident neutron energy of anti nu/sub p/(E), the average number of prompt neutrons emitted per fission, of sup 233 U, sup 235 U, and sup 239 Pu relative to anti nu/sub p/ ( sup 252 Cf), the average number of prompt neutrons emitted in spontaneous fission of sup 252 Cf. The incident energy range was 0.0005 to 10 MeV. A white neutron source was generated by the Oak Ridge Electron Linear Accelerator and the energies of the neutrons incident on the fissile samples were determined by time-of-flight techniques. The fissile sample and the sup 252 Cf standard were contained in a fission chamber surrounded by a large volume (0.91 m exp 3 ) liquid scintillator loaded with gadolinium. Fissions were detected by the fission chamber and the neutrons were detected by the scintillator. The results for sup 239 Pu agree over most of the energy range with the results of the evaluation of Manero and Konshin. However, the present results are larger for sup 235 U than those of Manero and Konshin and for sup 233 U the present data yield a different energy dependence in the interval 100 to 600 keV. Final results are displayed. (ERA citation 10:035464)