Reliability of the partial photoneutron reaction cross sections for 139La and 145, 148Nd

The cross sections of partial photoneutron reactions for 139La and 145,148Nd free from the shortcomings of the different methods for determination of neutron multiplicity used on the beams of quasimonoenergetic annihilation photons and bremsstrahlung were evaluated. The new data for (γ, 1n), (γ, 2n) and (γ, 3n) reactions cross sections were obtained using the experimental–theoretical method of evaluating the cross sections of the partial reactions, satisfying the reliability criteria imposed. It was shown that noticeable deviations of the experimental cross sections from the evaluated values result from the unreliable sorting of neutrons between the channels with multiplicities 1, 2 and 3.