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A series of experiments has been performed to measure the dependence on the incident neutron energy of v p {E), the average number of prompt neutrons emitted per fission, of 233 U, 235 U, and 239 Pu relative to v p ( 252 Cf), the average number of prompt neutrons emitted in spontaneous fission of 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 252 Cf standard were contained in a fission chamber surrounded by a large volu (0.91 m 3 ) liquid scintillator loaded with gadolinium. Fissions were detected by the fission chamber and the neutrons were detected by the scintillator. The results for 239 Pu agree over most of the energy range with the results of the evaluation of Manero and Konshfa. However, the present results are larger for 235 U than those of Manero and Konshin and for 233 U the present data yield a different energy dependence in the interval 100 to 600 keV. Final results are displayed.

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