CONVERGENT CLOSE-COUPLING CALCULATIONS OF LOW-ENERGY POSITRON ATOMIC-HYDROGEN SCATTERING

The convergent close-coupling approach developed by the authors is applied to positron scattering from atomic hydrogen below the first excitation threshold. In this approach the multichannel-expansion one-electron states are obtained by diagonalizing the target Hamiltonian in a large Laguerre basis. It is demonstrated that this expansion of the scattering wave function is sufficient to reproduce the very accurate low-energy variational results, provided target states with l less-than-or-equal-to 15 are included in the expansions.