INVESTIGATION OF RESONANCE STRUCTURE OF NEUTRON CROSS-SECTIONS AND α-VALUE OF U-235 FOR DIFFERENT TEMPERATURES

Authors & Affiliations

Grigoriev Yu.V.1, Kitaev V.Ya.1, Sinitsa V.V.1, Faikov-Stanchik H.2,3, Mezentseva Zh.V.2, Safronov Yu.V.2, Stempinsky M.2,3, Yaneva N.B.2,4
1State Scientific Centre - A.I. Leipunsky Institute for Physics and Power Engineering, Obninsk, Russia, Россия
2Joint Institute for Nuclear Research, Dubna, Russia
3University of Lodz, Lodz, Poland
4Institute for Nuclear Research and Nuclear Energy, Sophia, Bulgaria

Abstract

The time-of-flight spectra for γ-ray multiplicities from 1 to 15 were measured on the 122 m flight path of the IBR-30 pulsed neutron booster using the 16-section liquid scintillation detector with the 80 l total volume for thin metallic 235U radiator-sample (0.25 mm) with and without 0.5 mm thickness 235U filter-sample at two temperatures (100° and 293°). Multiplicity spectra and alpha values α=σγf were obtained from time-of-flight spectra after subtracting background components for the energy groups over the range of 2.15-2150 eV with and without filter samples of 235U. The self-indication functions in capture and fission cross-sections for these two temperatures and the Doppler-coefficient for the alpha values were determined from the time-of-flight spectra of 3-rd and sum of the 6 to 9-th multiplicities.

Keywords
time-of-flight spectra, γ-ray, multiplicity spectra, alpha values, self-indication function, capture and fission cross-sections

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

References

UDC 539.17.013

Problems of Atomic Science and Technology. Series: Nuclear Constants, issue 1-2, 2002, pp. 63-69