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Ab initio QED Treatment of the Two-Photon Annihilation of Positrons with Bound Electrons
- Source :
- Physical review letters. 123(9)
- Publication Year :
- 2019
-
Abstract
- The process of a positron $\unicode{x2013}$ bound-electron annihilation with simultaneous emission of two photons is investigated theoretically. A fully relativistic formalism based on $\textit{ab initio}$ 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 atom, for which a strong contradiction between theory and experiment was previously stated. The results obtained here resolve this long-standing disagreement and, moreover, demonstrate a sizeable difference with approaches so far used for calculations of the positron $\unicode{x2013}$ bound-electron annihilation process, namely, the $\textit{Lee's}$ and $\textit{impulse}$ approximations.<br />11 pages, 4 figures, 1 table, 46 references
Details
- ISSN :
- 10797114
- Volume :
- 123
- Issue :
- 9
- Database :
- OpenAIRE
- Journal :
- Physical review letters
- Accession number :
- edsair.doi.dedup.....912af91b0d9d5ec5abc0114cd8bb22ac