Positronium collisions with rare-gas atoms

Abstract

We calculate elastic scattering of positronium (Ps) by the Xe atom using the recently developed pseudopotential method [I. I. Fabrikant and G. F. Gribakin, Phys. Rev. A 90, 052717 (2014)] 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 (breakup). 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.

7 pages, 7 figures, submitted to J. Phys. B

References in corpus (3)

• Similarity between positronium-atom and electron-atom scattering
• Ps-atom scattering at low energies
• van der Waals coefficients for positronium interactions with atoms

Cited by in corpus (2)

• Calculations of positronium-atom scattering using a spherical cavity
• Many-body theory for positronium scattering and pickoff annihilation in noble-gas atoms