Abstract
The elastic scattering of positrons from noble gases has been formulated in a frozen-core version of the polarised-orbital approximation. This approximation has been applied to the scattering of positrons from krypton and xenon. The authors present results for phaseshifts and elastic, diffusion and annihilation cross sections in the low-energy (elastic scattering) region, as well as the angular correlation of the photons produced during annihilation. Good agreement is obtained between the elastic scattering cross section and recent experimental results for xenon below the positronium formation threshold. The agreement is less satisfactory in the case of krypton.