Data on photoneutron reactions from various experiments for 133Cs, 138Ba and 209Bi nuclei


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Abstract

Basic methods for determining cross sections for photoneutron partial reactions are examined. They are obtained directly in experiments with quasimonoeneregetic annihilation photons or from the cross section for the (γ, xn) = (γ, 1n) + 2(γ, 2n) + 3(γ, 3n) +... neutron-yield reaction in experiments with bremsstrahlung photons by introducing corrections based on statistical nuclear-reaction theory. The difference in the conditions of these experiments, which leads to discrepancies between their results because of sizable systematic errors, is analyzed. Physical criteria are used to study the reliability of data on the photodisintegration of 133Cs, 138Ba, and 209Bi nuclei. The cross sections for partial and total reactions satisfying the reliability criteria are evaluated within the experimental–theoretical method (σeval(γ, in) = Fitheor × σexpt(γ, xn)) on the basis of the experimental cross sections σexpt(γ, xn) and the results of the calculations within the combined model of photonuclear reactions.

About the authors

V. V. Varlamov

Skobeltsyn Institute of Nuclear Physics

Author for correspondence.
Email: Varlamov@depni.sinp.msu.ru
Russian Federation, Moscow, 119991

B. S. Ishkhanov

Skobeltsyn Institute of Nuclear Physics; Faculty of Physics

Email: Varlamov@depni.sinp.msu.ru
Russian Federation, Moscow, 119991; Moscow, 119991

V. N. Orlin

Skobeltsyn Institute of Nuclear Physics

Email: Varlamov@depni.sinp.msu.ru
Russian Federation, Moscow, 119991

N. N. Peskov

Skobeltsyn Institute of Nuclear Physics

Email: Varlamov@depni.sinp.msu.ru
Russian Federation, Moscow, 119991

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