Cross sections of partial photoneutron reactions: problems of reliability and new data

Davydov, А.I.; Varlamov, V.V.; Orlin, V.N.

Авторы: Davydov А.I., Varlamov V.V., Orlin V.N.
Журнал: Moscow University Physics Bulletin
Том: 78
Номер: 3
Год издания: 2023
Издательство: Allerton Press
Местоположение издательства: New York, N.Y., United States
Первая страница: 291
Последняя страница: 302
DOI: 10.3103/S0027134923030062
Аннотация: —The cross sections of partial photoneutron reactions (γ, 1n), (γ, 2n), and (γ, 3n), the majority of which were obtained using beams of quasimonoenergetic annihilation photons, are discussed. Significant systematic uncertainties in the experimental results that far exceed the achieved statistical accuracy are analyzed. Using objective physical criteria for the reliability of partial reaction cross section data, experimental results for ∼50 nuclei ranging from 51V to 209Bi are examined. It is shown that in many cases, systematic uncertainties in experimental reaction cross sections are large, and these data do notmeet physical criteria of data reliability. An experimental-theoretical method for evaluating reaction cross sections satisfying these criteria is described. The reasons for systematic uncertainties of several types are identified, which are due to both the limitations of the photoneutron multiplicity sorting method used in the experiments, and the peculiarities of the employed neutron detectors. New, reliable evaluated cross sections of partial reactions and the total photoneutron reaction (γ, 1n)+(γ, 2n)+(γ, 3n) are presented.
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