An algebraic coupled-state calculation of positron-hydrogen scattering carried out with an enlarged eight-state (E8S) coupling scheme, that is composed of a sufficiently high number of short-ranged correlation terms and eight hydrogen and positronium states $\left[\right(1s,2s,2p,3\mathrm{}\overline{p}\left)\mathrm{H}-\right(1s,2s,2p,3\mathrm{}\overline{p}\left)\mathrm{Ps}\right],$ provides results of the phase shift and cross section, agreeing excellently with our accurate enlarged six pseudostate (E6PS) values in both $e^{+}-\mathrm{H}$ and $\mathrm{Ps}\mathrm{}\left(1s\right)-p$ entrance channels. Our results serve to assert that very accurate values of the phase shift and cross section in both entrance channels have been attained with our E6PS, E8PS, and E8S Harris-Nesbet calculations. The present E8S calculation supersedes our deficient modified enlarged six-state one done previously.

• Received 25 November 1996

DOI:https://doi.org/10.1103/PhysRevA.56.1332