INTEGRAL PROMPT NEUTRON SPECTRA OF THE U-235 FISSION BY THERMAL NEUTRON INDUCED

Authors & Affiliations

Vorobyev A.S., Shcherbakov O.A.
B.P. Konstantinov Nuclear Physics Institute, St. Petersburg, Russia

Abstract

Fission neutron energy spectra were measured for 235U and 252Cf. Measurements were made simultaneously at 11 angles between the flight paths of the outgoing neutrons and the outgoing light fragments. The flight paths of the light fragments were determined using multiwire proportional counters. Neutron energy was determined by the time-of-flight method. Neutrons and γ-quantum events were separated using discrimination by impulse shape. The data were analysed to obtain the ratio of the integral spectra for the 35U(n,f) and 252Cf(s.f) reactions. The integral fission neutron spectrum for 235U(n,f) was determined from this ratio by assuming a fission neutron spectrum for 252Cf(s.f) of standard shape.

Keywords
energy fission, neutron, spectra, 235U, 252Cf, flight time method, prompt fission

Article Text (in English, PDF, Translated by IAEA)

References

UDC 539.17

Problems of Atomic Science and Technology. Series: Nuclear Constants, issue 1-2, 2011-2012