A new approach for analysis and evaluation of partial photoneutron reaction cross sections

A unified understanding of (γ, n) and (n, γ) reactions and direct neutron-multiplicity sorting

“…Based on the Brink hypothesis of the approximate equality of the upward and downward γ SF, one can construct the γ SF by combining (γ ,n), (γ ,γ ) and the Oslo data with the (γ ,n) cross section as absolute normalization. Figures 6 and 7 show thus constructed γ SF for 117 Sn [13] and 74 Ge [15].…”

“…After the elaborate efforts of evaluating the Livermore and Saclay data of partial photonuetron cross sections, especially those based on the transitional neutron-multiplicity function [15] as well as (γ , n) cross sections below twoneutron separation energies compiled in the photonuclear data library [8], it turned out that the discrepancy between the Livermore and Saclay data cannot be resolved in any systematic way. In many cases of the partial cross sections, Saclay provided larger cross sections for (γ , n) reactions than Livermore and vice versa for (γ , 2n) reactions.…”

Photoneutron reaction cross sections from various experiments – analysis and evaluation using physical criteria of data reliability

“…3. [12], squares [15], solid line [8], dots [14]); c-197 Au (triangles [17], squares [18], solid line [8], dots [9]). …”

“…In [14] it was shown for 159 Tb that in the energy range between thresholds B 2n and B 3n integrated cross section σ eval-int (γ , 1n) is about 20% larger than the Livermore data [12] and about 20% smaller than the Saclay measurements [15], whereas σ eval-int (γ , 2n) is 15% larger than in [15] and 20% smaller as compared to those of [12]. Therefore the difference between evaluated and experimental [12,15] values of the important cross section ratio σ eval-int (γ , 2n)/σ eval-int (γ , 1n) is ∼ 30%.…”

“…It addition to the data obtained before [9,11,14,16,20,21] many new photoneutron reaction cross sections will be evaluated using the experimentally-theoretical method and data reliability criteria described.…”