Positronium formation and threshold behavior in positron-sodium collisions at low energies

Ning-Ning Gao, Hui-Li Han, Ting-Yun Shi

We investigate the elastic and inelastic scattering of positrons by sodium atoms in both the ground state, Na($3s$), and excited states, Na*($3p$, $4s$, $3d$), using the hyperspher…