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arXiv 2307.03383physics.atom-phhep-ph
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低能条件下的原子屏蔽与$e^+e^-$对光生

Atomic screening and $e^+e^-$ pair photoproduction at low energies

P. A. Krachkov, A. I. Milstein

备注：
8 pages, 10 figures
发表信息：
Physics Letters B 846 138224 (2023)
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AI总结：

本文研究了原子电子屏蔽效应对连续谱电子和正电子波函数小距离行为的影响，考虑了静态势、极化势及交换相互作用，推导出原子场中近阈值$e^+e^-$对光生截面的解析表达式，并指出屏蔽效应在近阈值区域显著影响截面及粒子分布。

摘要：

本文研究了原子电子的屏蔽效应对连续谱中电子和正电子波函数在小距离处行为的影响。结果表明，这些渐近行为不仅受原子电子的静态势影响，还受极化势以及交换相互作用的影响，后者对非相对论电子至关重要。本文推导出了在原子场中近阈值处$e^+e^-$对光生截面的简单解析表达式。此外，还探讨了生成粒子的能谱与角分布。研究表明，在近阈值区域，屏蔽效应会显著影响截面。

英文摘要：

The effect of screening by atomic electrons on the behavior of electron and positron wave functions in the continuous spectrum at small distances is studied. It is shown that these asymptotics are affected not only by the static potential of atomic electrons, but also by the polarization potential, as well as by the exchange interaction, which is essential for nonrelativistic electrons. A simple analytical expression is obtained for the photoproduction cross section of $e^+e^-$ pair in an atomic field near the threshold. The spectrum and angular distribution of the produced particles are considered. It is shown that screening significantly affects the cross section in the near-threshold region.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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