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Zaytsev VA, Volotka AV, Yu D, Fritzsche S, Ma X, Hu H, Shabaev VM. Ab initio QED Treatment of the Two-Photon Annihilation of Positrons with Bound Electrons. PHYSICAL REVIEW LETTERS 2019; 123:093401. [PMID: 31524486 DOI: 10.1103/physrevlett.123.093401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2019] [Revised: 05/10/2019] [Indexed: 06/10/2023]
Abstract
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 atom, for which a strong contradiction between theory and experiment was previously stated. The results obtained here resolve this longstanding disagreement and, moreover, demonstrate a sizable difference with approaches so far used for calculations of the positron-bound-electron annihilation process, namely, Lee's and the impulse approximations.
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Affiliation(s)
- V A Zaytsev
- Department of Physics, St. Petersburg State University, Universitetskaya naberezhnaya 7/9, 199034 St. Petersburg, Russia
| | - A V Volotka
- Department of Physics, St. Petersburg State University, Universitetskaya naberezhnaya 7/9, 199034 St. Petersburg, Russia
- Helmholtz-Institut Jena, Fröbelstieg 3, D-07743 Jena, Germany
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - D Yu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - S Fritzsche
- Helmholtz-Institut Jena, Fröbelstieg 3, D-07743 Jena, Germany
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
- Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena, Jena D-07743, Germany
| | - X Ma
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - H Hu
- Hypervelocity Aerodynamics Institute, China Aerodynamics Research and Development Center, 621000 Mianyang, Sichuan, China
| | - V M Shabaev
- Department of Physics, St. Petersburg State University, Universitetskaya naberezhnaya 7/9, 199034 St. Petersburg, Russia
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Thimmaiah S, Bhajantri RF, Nambissan PMG, Vasachar R, Rathod SG, Poojary B. Positron annihilation and other experimental studies on polycarbonate/MPDMAPP nanocomposite. J Appl Polym Sci 2015. [DOI: 10.1002/app.42053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Sheela Thimmaiah
- Department of Physics; Mangalore University; Mangalagangotri 574 199 Karnataka India
| | | | | | | | - Sunil Gurunath Rathod
- Department of Physics; Mangalore University; Mangalagangotri 574 199 Karnataka India
| | - Boja Poojary
- Department of Chemistry; Mangalore University; Mangalagangotri 574 199 Karnataka India
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Recent advances in the calculations for momentum distributions of annihilating electron-positron pairs in solids. ADVANCES IN QUANTUM CHEMISTRY 2003. [DOI: 10.1016/s0065-3276(03)42044-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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