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<i>Ab initio</i> QED Treatment of the Two-Photon Annihilation of Positrons with Bound Electrons
The process of a positron-bound-electron annihilation with simultaneous emission of two photons is investigated theoretically. A fully relativistic formalism based on an ab initio QED description of the process is worked out. The developed approach is applied to evaluate the annihilation of a positron with K-shell electrons of a silver …