Abstract
The characteristics of prompt fission neutrons (PFN)--spectra and average number of neutrons--are important for nuclear reactor calculations. This paper takes into account the special features associated with the characteristics of the fission fragments. The Hauser-Feshbach statistical theory is used to calculate the characteristics of PFN with the following differences: a more accurate account of the cascade nature of neutron emission is presented, a different method of determining the average excitation energy of the fragments is used, and an expression for the level density which takes account of the shell structure of nuclei is given. Results are presented of a calculation of the spectra and multiplicity distribution of PFN for the most important cases, namely the spontaneous fission of Cf 252 and the thermal-neutron fission of U 235.
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