Positron elastic scattering by a semifilled-shell atom
| Autor: | Amusia, M. Ya., Dolmatov, V. K., Chernysheva, L. V. |
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| Rok vydání: | 2021 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/1361-6455/ac2e49 |
| Popis: | We theoretically study the positron elastic scattering by an atom with a multielectron semifilled subshell in its structure. The positron scattering by the Mn($...3d^{5}4s^{2}$,$^{6}S)$ atom with a $3d^{5}$ semifilled subshell ($e^{+}+Mn$ scattering) is chosen as a case study. We account for both the electron correlation and the formation of a $e^{+}+e^{-}$ virtual positronium (Ps) in the intermediate states of the $e^{+}+Mn$ system. Electron correlation is taken into account in the framework of the self-energy part of the scattering positron Green function generalized for the application to semifilled-shell atoms. The influence of the virtual Ps formation on $e^{+}+Mn$ scattering is taken into account by the reduction of the energy of the virtual \textit{positron plus atomic-excited-configuration} states by the Ps-binding energy, to a reasonable approximation. We unravel the importance and specificity of the influence of both the virtual Ps and electron correlation on $e^{+}+Mn$ elastic scattering. We demonstrate spectacular differences between the electron and positron scattering processes. Comment: 9 pages, 8 figures |
| Databáze: | arXiv |
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