THE ENERGY SPECTRUM OF DELAYED NEUTRONS FROM THERMAL NEUTRON INDUCED FISSION OF U-235 AND ITS ANALYTICAL APPROXIMATION

Authors & Affiliations

Doroshenko A.Yu., Piksaikin V.M., Tarasko M.Z.
State Scientific Centre - A.I. Leipunsky Institute for Physics and Power Engineering, Obninsk, Russia

Abstract

The energy spectrum of the delayed neutrons is the poorest known of all input data required in the calculation of the effective delayed neutron fractions. In addition to delayed neutron spectra based on the aggregate spectrum measurements there are two different approaches for deriving the delayed neutron energy spectra. Both of them are based on the data related to the delayed neutron spectra from individual precursors of delayed neutrons. In present work these two different data sets were compared with the help of an approximation by gamma-function. The choice of this approximation function instead of the Maxwellian or evaporation type of distribution is substantiated.

Keywords
energy spectrum, delayed neutrons, aggregate spectra, U-235, thermal neutron, delayed neutron precursor, analytical approximation, gamma-function

Article Text (PDF, Translated by IAEA)

References

UDC 539.173.84

Problems of Atomic Science and Technology. Series: Nuclear Constants", issue 1, 2001