电子和正电子原子韧致辐射的比较研究
Comparative study of the electron- and positron-atom bremsstrahlung
摘要：
本文报道了电子原子和正电子原子韧致辐射的完全相对论处理。计算是基于狄拉克散射态在原子外场中的分波展开。比较了单、双微分截面和出射光子的Stokes参数对电子和正电子韧致辐射的影响。它表明，电子-正电子的韧致辐射谱的对称性，这是几乎精确的非相对论制度，在很大程度上被相对论效应删除。
英文摘要：
Fully relativistic treatment of the electron-atom and positron-atom bremsstrahlung is reported. The calculation is based on the partial-wave expansion of the Dirac scattering states in an external atomic field. A comparison of the electron and positron bremsstrahlung is presented for the single and double differential cross sections and the Stokes parameters of the emitted photon. It is demonstrated that the electron-positron symmetry of the bremsstrahlung spectra, which is nearly exact in the nonrelativistic regime, is to a large extent removed by the relativistic effects.
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