Determination of flux-weighted average cross-sections of natPb($\gamma$γ,xn), 208Pb($\gamma$γ,xn), and 209Bi($\gamma$γ,xn) reactions using bremsstrahlung end-point energies of 50-70 MeV
Abstract.The flux-weighted average cross-sections of the natPb($\gamma$γ,xn)198-204Pb reaction for the bremsstrahlung end-point energies of 50-70MeV were determined by activation and off-line $ \gamma$γ -ray spectrometric technique, using the 100 MeV electron linac at the Pohang Accelerator Laboratory (PAL), Korea. The relative cross-sections of the 208Pb($\gamma$γ,xn)202-204Pb and 209Bi($\gamma$γ,xn)203-206Bi reactions from our earlier work were updated to absolute values and compared with the present data. The photo-neutron cross-sections of natPb, 208Pb, and 209Bi were also calculated, as a function of the photon energy using the TALYS 1.6 code. The flux-weighted average cross-sections were obtained from the theoretical values of the TALYS 1.6 code, based on mono-energetic photons, and compared with the present experimental data. The values were found to be in good agreement with the present data for the 209Bi($\gamma$γ,xn)203-206Bi, 208Pb($\gamma$γ,xn)202-204Pb, and natPb($\gamma$γ,xn)198-202Pb reactions. However, the present data for the natPb($\gamma$γ,xn)203, 204Pb reactions were higher than the flux-weighted values obtained using the TALYS 1.6 code.