Measurements of positronium-formation cross sections for positrons scattered by Rb atoms.

Abstract

Measurements of positronium (Ps) -formation cross sections (upper and lower limits) for positrons (1{endash}17 eV) scattered by Rb atoms are reported. These measurements, along with recent measurements and calculations of total cross sections, provide evidence that coupling effects between Ps formation and other scattering channels may be very important for energies below 10 eV for Rb. {copyright} {ital 1996 The American Physical Society.}