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

IAEA Photonuclear Data Library 2019

“…The evaluated data for the photoneutron multiplicity sorting obtained agree well with the activation data. A further confirmation was the agreement found by making a detailed comparison [123] of the evaluated 197 Au (γ, 1n) and (γ, 2n) data with those obtained in activation measurements with bremsstrahlung [39].…”

“…After irradiating a target by bremsstrahlung with various end-point energies, γ-ray counting was carried out for residual nuclei. The γ-lines unique to residual nuclei were clearly identified in the γ-ray spectra measured with an energy-and efficiency-calibrated high-purity germanium (HPGe) detector [37][38][39]. Photonuclear reaction cross sections were deduced from the γ-lines.…”

IAEA Photonuclear Data Library 2019

“…The evaluated data for the photo-neutron multiplicity sorting obtained agree well with the activation data. A further confirmation was the agreement found by making a detailed comparison [122] of the evaluated 197 Au (γ, 1n) and (γ, 2n) data with those obtained in activation measurements with bremsstrahlung [39].…”

“…As a result, the partial cross sections σ eval (γ, in) fluctuate although the total photo-neutron yield cross section σ exp (γ, xn) seems to be reasonable. This can be seen clearly by calculating the differences between the experimental and evaluated integrated cross sections σ int,exp and σ int,eval for the (γ, 1n) reaction, ∆σ 1 = σ int,eval (γ, 1n) − σ int,exp (γ, 1n) , (39) and for the (γ, 2n) reaction,…”

“…The evaluation was made by the CCONE code [75] for medium to heavy nuclides. Some of the light nuclides with atomic number ≤ 20 were also taken from JENDL/PD-2016; 3 He, 6,7 Li, and 19 F. Those nuclear data were evaluated by the method described by Murata et al [144] with the ALICE-F code [87], except for 35,37 Cl, 36,38,40 Ar and 39,40,41 K, which were evaluated with CCONE [75]. In Murata's method, measured photo-absorption and (γ, 1nX) reaction cross sections were reproduced by resonances and quasi-deuteron disintegration models.…”