Low-energy scattering of electrons by positronium

Abstract
Elastic scattering of electrons from positronium (Ps) in the ɛ<5.105 eV energy region is considered. The calculations have been done on the basis of the adiabatic method, where this three-body problem reduces to multichannel scattering theory. Our results unambiguously establish the existence of an s-wave resonance at ɛr≊0.6 eV.