A study is made of the possible reasons for systematic discrepancies between the cross sections of photonuclear reactions measured with continuous-spectrum $\gamma$ rays CG and quasimonochromatic $\gamma$ rays QMG. It is shown to be necessary to perform a full processing for the published QMG cross sections (which in essence are reaction yields) by analogy with what is done in CG experiments. It is proposed to use a reduction method for this additional treatment of the QMG cross sections that enables one to evaluate the quality of the CG and QMG data clearly and to combine the results from experiments of both types in the reduction scheme. This reduction processing has been carried out. for a series of measured cross sections for photoneutron reactions on $^{12}C$ and $^{18}O$. It has been found that the additional processing of the QMG cross sections leads to much improved agreement with the CG ones.
Research Institute of Nuclear Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia Department of Mathematics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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