Gamma-ray Spectra and Enhancement Factors for Positron Annihilation with Core Electrons

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Abstract

Many-body theory is developed to calculate the γ spectra for positron annihilation in noble-gas atoms. Inclusion of electron-positron correlation effects and core annihilation gives spectra in excellent agreement with experiment [K. Iwata et al., Phys. Rev. Lett. 79, 39 (1997)]. The calculated correlation enhancement factors γnl for individual electron orbitals nl are found to scale with the ionization energy Inl (in eV), as γnl=1+ √A/Inl+(B/Inl)β, where A≈40  eV, B≈24  eV, and β≈2.3.
Original languageEnglish
Article number093201
Number of pages5
JournalPhysical Review Letters
Volume114
Issue number9
Early online date04 Mar 2015
DOIs
Publication statusPublished - 06 Mar 2015

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