INVESTIGATION OF THE RESONANCE STRUCTURE OF NEUTRON CROSS-SECTIONS FOR THORIUM-232 AND NEPTUNIUM-237 IN THE 2 eV-100 keV ENERGY RANGE

Authors & Affiliations

Grigor'ev Ju.V.1, Sinica V.V.1, Gundorin G.N.2, Popov Ju.P.2, Fajkov-Stanchik Kh.2
1A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
2Joint Institute for Nuclear Research, Dubna, Russia

Abstract

Experimental results of transmissions for three sample-filters of thorium-232 with thickness 0.01303 at/b, 0.02655 at/b and 0.0517 at/b and for three samples of neptunium-237 with thickness 0.002074 at/b, 0.00417 at/b, 0.01253 at/b are presented in this work. Thorium samples are metal discs with 45 mm diameter in aluminium containers. Samples were made of NpO2 powder placed in cylindrical aluminium hermetic containers with 56 and 43 mm inside diameters. Measurement was carried on the pulsed neutron booster IBR-30 of JINR in Dubna on the 123 m flight path with boron counters SNM-13 as detector. Point-wise and group cross-sections were extracted from transmission data. Analogous values were calculated by GRUCON code on the basis of the evaluated data from ENDF/B-VI and JENDL-3 libraries.

Keywords
resonant structure, neutron cross sections, thorium-232, neptunium-237, transuranic isotopes, group and total differential cross section

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

References

UDC 539.172.013

Problems of Atomic Science and Technology. Series: Nuclear Constants", issue 1, 1998