Positronium collisions with rare-gas atoms

G. F. Gribakin, A. R. Swann, R. S. Wilde, I I Fabrikant

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Abstract

We calculate elastic scattering of positronium (Ps) by the Xe atom using the recently developed pseudopotential method (Fabrikant and Gribakin 2014 Phys. Rev. A 90 052717) and review general features of Ps scattering from heavier rare-gas atoms: Ar, Kr and Xe. The total scattering cross section is dominated by two contributions: elastic scattering and Ps ionization (break-up). To calculate the Ps ionization cross sections we use the binary-encounter method for Ps collisions with an atomic target. Our results for the ionization cross section agree well with previous calculations carried out in the impulse approximation. Our total Ps–Xe cross section, when plotted as a function of the projectile velocity, exhibits similarity with the electron-Xe cross section for the collision velocities higher than 0.8 a.u., and agrees very well with the measurements at Ps velocities above 0.5 a.u.
Original languageEnglish
Article number064004
Number of pages8
JournalJournal of Physics B: Atomic Molecular and Optical Physics
Volume49
Issue number6
DOIs
Publication statusPublished - 02 Mar 2016

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