title: Capture cross section measurement analysis in the Californium-252 spectrum with the Monte Carlo method.
abstract: Absolute average capture cross sections of gold, thorium, tantalum, molybdenum, copper and strontium in (252)Cf spontaneous fission neutron spectrum were simulated for two types of experiment setups preformed by Z. Dezso and J. Csikai and by L. Green. The experiments were simulated with MCNP5 using cross section data from the ENDF/B-VII.0 library. The determination of neutron backscattering was calculated with the use of neutron flagging. Correction factors to experimentally measured values were determined to obtain average cross sections in a pure (252)Cf spontaneous fission spectrum. Influence of concrete wall thickness, air moisture and room size on the average cross section was analyzed. Correction factors amounted to about 30%. Corrected values corresponding to average cross sections in a pure (252)Cf spectrum were calculated for (197)Au, (232)Th, (181)Ta, (98)Mo, (65)Cu and (84)Sr. Average cross sections were also calculated with the RR_UNC software using IRDFF-v.1.05 and ENDF/B-VII.0 libraries. The revised average radiative capture cross sections are 75.5±0.1 mb for (197)Au, 87.0±1.6 mb for (232)Th , 98.0±4.5 mb for (181)Ta, 21.2±0.5 mb for (98)Mo, 10.3±0.3 mb for (63)Cu, and 34.9±6.5 mb for (84)Sr.
authors.affiliation: Krško Nuclear Power Plant, Vrbina 12, SI-8270 Krško, Slovenia. Electronic address: stanko.manojlovic@nek.si.
authors.forename: Stanko
authors.initials: S
authors.lastname: Manojlovič
authors.affiliation: Jožef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia; International Atomic Energy Agency, Vienna Int. Centre, A-1400 Vienna, Austria. Electronic address: a.trkov@iaea.org.
authors.forename: Andrej
authors.initials: A
authors.lastname: Trkov
authors.affiliation: Jožef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia; Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, SI-1000 Ljubljana, Slovenia. Electronic address: gasper.zerovnik@ijs.si.
authors.forename: Gašper
authors.initials: G
authors.lastname: Žerovnik
authors.affiliation: Jožef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia. Electronic address: luka.snoj@ijs.si.
authors.forename: Luka
authors.initials: L
authors.lastname: Snoj
keywords: Average cross section; Cf-252 spontaneous fission spectrum; Monte Carlo method; Reaction rate measurements