Implementation of a model potential in the Schwinger multichannel method to describe polarization in positron-atom and -molecule scattering: Studies for the noble-gas atoms, H2, and N2

In this study, we evaluated a polarization scheme within the framework of the Schwinger multichannel method, using a model potential to describe positron-molecule polarization and correlation. Our aim was to calculate integral and differential cross sections for elastic scattering of positrons by noble gas atoms, hydrogen molecules, and nitrogen molecules. We compared our results with previous theoretical and experimental data, as well as with new results from a parallelized version of our computer codes, which allowed us to push the limits of our current ab initio methodology for small molecules. Our findings show that the model potential can recreate the s-wave integral cross sections from our best ab initio calculations, and also helps better understand the scattering process.