INVESTIGATION OF RESONANCE STRUCTURE AND TEMPERATURE DEPENDENCE OF Pu-239 NEUTRON CROSS SECTIONS

Authors & Affiliations

Grigor'ev Yu.V.1, Sinitsa V.V.1, Gundorin N.A.2
1Institute of Physics and Power Engineering, Obninsk, Russia
2Joint Institute of Nuclear Research, Dubna, Russia

Abstract

The measurements of full transmissions and selfindication functions in the plutonium-239 fission cross-section were measuredat the 60m, 123m and 1006m flight paths of IBR-30. A low-efficiency He-3,B-10 counters and an ionization fission chamber with plutonium-239 (1.6 g) were usedas detectors. Metal plutonium-239 disks with diameter 45 mm served filter samples-filters, which cooled to the temperature of liquid and heated to 293K. The measurements have been taken with 7 thicknesses of the samples-filters. From transmissions and self-indications, by using the method of subgroups, the group meen cross-sections and self-shielding resonance factors in the energy range from 4.65 eV to 200 keV with error of 3-10% have been received. Analogous resonance characteres were calculated on the base of the BROND-2, ENDF/B-6 and JENDL-3 evaluated data libraries by means of the GRUCON computer program.

Keywords
transmission and self-indication function, ionization fission chamber, the sample-folder of plutonium-239, mean group cross-resonance self-shielding factors

Article Text (PDF, in Russian)

References

UDC 621.039.51

Problems of Atomic Science and Technology. Series: Nuclear Constants", issue 1, 1997