^1,3S and ^1,3P electron-positronium scattering

^1,3S and ^1,3P electron-positronium scattering

S. J. Ward and William Mitchell, University of North Texas



Using the inverse Kohn variational method and elaborate trial wave functions we have determined ^1,3S and ^1,3P phase shifts for electron-positronium scattering. These new calculations are an extension of prior work [1-3]. We have re-optimized the nonlinear parameters from the earlier calculations and, for most of the energy range for each partial wave, we have increased the number of linear parameters in the trial wave function. Furthermore, we have accurately determined parameters for ¹S, ¹P and ³P resonances. We plan to show a comparison our results with the prior results [1-3].

[1] S. J. Ward, J. W. Humberston and M. R. C. McDowell, J. Phys. B 18, L525 (1985).

[2] S. J. Ward, J. W. Humberston and M. R. C. McDowell, J. Phys. B 30, 127 (1987).

[3] S. J. Ward, Thesis, University of London, Unpublished, 1986.