Measurement of flux-weighted average cross sections for 197Au(γ,xn) reactions and isomeric yield ratios of 196m,gAu with bremsstrahlung

Abstract

Photo-neutron cross sections of Au-197 were experimentally determined for the bremsstrahlung end-point energies of 50, 60, and 70 MeV, by utilizing activation and off-line gamma-ray spectrometric technique, using the 100 MeV electron linac at the Pohang Accelerator Laboratory (PAL), Pohang, Korea. The Au-197(gamma, xn; x = 1-6) reaction cross sections were calculated as a function of the bombarding photon energy by using the TALYS 1.6 computer code with default parameters. The flux-weighted average cross sections were obtained from the literature data and the theoretical values of TALYS 1.6 and TENDL-2014, for mono-energetic photons, and are found to be in good agreement with the present data. Isomeric yield ratios of (196m2,g)AU from the Au-197(gamma, n) reaction were also determined for the bremsstrahlung end-point energies of 50, 60, and 70 MeV, from the reaction cross sections of m2- and g-states, based on the present experimental data, and are found to be in good agreement with the theoretical values based on TALYS 1.6 and TENDL-2014. (C) 2016 Elsevier B.V. All rights reserved.