Single- and double-ionization processes of antiproton-helium and antiproton-molecular hydrogen collisions in the keV energy range

We report on an ab initio model to describe single-and double-ionization processes in antiproton collisions with atoms and molecules. Our model is based on a fully correlated close-coupling approach and a Dyson orbital analysis. Furthermore, we employ the concept of a correlation integral in order to quantify and gain insights into the effects of electronic correlation on the ionization processes. Our model is applied to the prototype antiproton-helium and antiproton-molecular hydrogen collision systems in the keV energy range.