Аннотация:An experimental and theoretical investigation is performed for the reliability of data on the (γ, 1n)and (γ, 2n) reaction cross sections of 51V and 59Co nuclei obtained on bremsstrahlung γ rays. Objective physical criteria are used to evaluate partial photoneutron reaction cross sections. It is found that partial reaction cross sections obtained by adding corrections to neutron yield cross sections σ(γ, xn) = σ(γ, 1n) + 2σ(γ, 2n) calculated within statistical theory do not satisfy the reliability criteria. Cross sections of the (γ, 1n) reactionare greatly underestimated in the considered experiments, while those of the (γ, 2n) reaction are overestimated, due obviously to the way information is obtained on the partial reaction cross sections by applying statistical theory corrections to the cross section of the σ(γ, xn) yield. When describing the (γ, 1n) reaction cross section at photon energies below threshold B2n of the (γ, 2n) reaction, such corrections create substantial systemic uncertainties in the ranges of energy where the two partial reactions compete.
