Abstract
The hyperspherical hidden crossing method with the correction term (HHCM+cor) has been used to calculate partial wave Ps(1s)-formation cross sections for low-energy e+ − H, e+ − Li and e+ − Na collisions. The Stückelberg phase varies in a systematic way as a function of atomic number Z, incident positron momentum k+, and total orbital angular momentum L and provides an explanation for the small S-wave cross section for all three systems.
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