Positronium scattering by atoms and molecules at low energies

Abstract

The recent theoretical and experimental activities in positronium (Ps) scattering by atoms and molecules are reviewed with special emphasis at low energies. We critically compare the results of different groups $-$ theoretical and experimental. The theoretical approaches considered include the $R$-matrix and close-coupling methods applied to Ps-H, Ps-He, and Ps-Li scattering, and a coupled-channel approach with a nonlocal model-potential for Ps scattering by H, He, H${}_2$, Ne, Ar, Li, Na, K, Rb, Cs, and Ps and for pickoff quenching in Ps-He scattering. Results for scattering lengths, partial, total and differential cross sections as well as resonance and binding energies in different systems are discussed.

6 revtex pages, 3 postscript figures

References in corpus (7)

• Positronium atom scattering by H_2 in a coupled-channel framework
• Convergent variational calculation of positronium-hydrogen-atom scattering lengths
• Differential cross sections for elastic and inelastic positronium-hydrogen-atom scattering
• Differential and partial cross sections of elastic and inelastic positronium-helium-atom scattering
• Variational calculation of positronium-helium-atom scattering length
• S-, P- and D-wave resonances in positronium-sodium and positronium-potassium scattering
• Resonances in positronium-rubidium and positronium-cesium scattering