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Capture cross section measurement analysis in the Californium-252 spectrum with the Monte Carlo method
Manojlovič, Stanko ...
Absolute average capture cross sections of gold, thorium, tantalum, molybdenum, copper and strontium in 252 Cf spontaneous fi ssion 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 cal- culated with the use of neutron fl agging. Correction factors to experimentally measured values were determined to obtain average cross sections in a pure 252 Cf spontaneous fi ssion spectrum. In fl uence 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 7 0.1 mb for 197 Au, 87.0 7 1.6 mb for 232 Th , 98.0 7 4.5 mb for 181 Ta, 21.2 7 0.5 mb for 98 Mo, 10.3 7 0.3 mb for 63 Cu, and 34.9 7 6.5 mb for 84 Sr.
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