Measurement of effective neutron cross section of the reaction ~(98)Mo (n, γ) 'Mo in TRR nuclear reactor by using thermal neutrons

摘要

The effective cross section of ~(98)Mo was measured using Westcott s convention. Diluted samples of natural MoO_3 were irradiated for 15 min in the channel D_6 of the core of the Tehran research reactor (TRR). The neutron flux at irradiation position was measured using diluted Au_2O_3 and CO_3O_4. The effective cross section was deduced as 0.526 ± 0.02b obtained from thermal flux. Index in Westcott s convention, r(T/T_0)/(1/2) at the irradiation position was obtained as 0.0545 ± 0.001. The contribution of the epithermal neutrons in total neutron activity of "Mo was 69%. The necessary correction factors such as thermal neutron self-shielding (Cth) and epithermal neutron self-shielding (C_(epi)), and gamma-ray attenuation (F_g) were taken into account. The results were presented and compared with effective cross section in evaluated nuclear data laboratory such as JENDL-4, KAERI and evaluated data by Mughabghab.