Many-Body Theory Calculations of Positron Scattering and Annihilation in H$_2$, N$_2$ and CH$_4$

• URL: http://arxiv.org/abs/2303.02083v1
• Date: Fri, 3 Mar 2023 16:56:45 GMT
• Title: Many-Body Theory Calculations of Positron Scattering and Annihilation in H$_2$, N$_2$ and CH$_4$
• Authors: C. M. Rawlins, J. Hofierka, B. Cunningham, C. H. Patterson and D. G. Green
• Abstract summary: The recently developed ab initio many-body theory of positron molecule binding is combined with the shifted pseudostates method. The method provides uniformly good results for annihilation rates on all the targets, from the simplest to larger targets.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The recently developed ab initio many-body theory of positron molecule binding [J. Hofierka et al., Nature, 606, 688 (2022)] is combined with the shifted pseudostates method [A. R. Swann and G. F. Gribakin, Phys. Rev. A 101, 022702 (2020)] to calculate positron scattering and annihilation rates on small molecules, namely H$_2$, N$_2$ and CH$_4$. The important effects of positron-molecule correlations are delineated. The method provides uniformly good results for annihilation rates on all the targets, from the simplest (H$_2$, for which only a sole previous calculation agrees with experiment), to larger targets, where high-quality calculations have not been available.

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