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Photonuclear channel of ~7Be production in the Earth's atmosphere

机译：地球大气中〜7Be产生的光核通道

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摘要

Measurements of average values of cross sections for the A(γ,X) ~7Be photonuclear reactions on nitrogen, oxygen, and carbon of natural isotopic composition were performed in the energy range from the threshold to 90 MeV. On the basis of the measured cross sections for ~7Be photoproduction and on the basis of the results obtained by simulating the nuclear-electromagnetic cascade in the Earth's atmosphere, the contribution of the photonuclear mechanism to the production of the cosmogenic radioisotope ~7Be in the atmosphere and its latitude dependence were investigated for the first time. It is shown that the contribution of the photonuclear mechanism is commensurate with the contribution of the proton and neutron mechanisms of ~7Be production in the atmosphere and that the inclusion of this mechanism is mandatory in analyzing the accumulation and transfer of ~7Be in the planetary boundary layer.
机译：在从阈值到90 MeV的能量范围内，对自然同位素组成的氮，氧和碳进行A（γ，X）〜7Be光核反应的截面平均值的测量。根据测得的〜7Be的光生截面以及基于模拟地球大气中的核电磁级联所获得的结果，光核机制对大气中约7Be宇宙产生放射性同位素的产生的贡献并首次研究了其纬度依赖性。结果表明，光核机制的贡献与大气中〜7Be产生的质子和中子机制的贡献相称，并且在分析〜7Be在行星边界中的积累和转移时，必须包含该机制。层。

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