TOTAL  CROSS SECTIONS
FOR LOW ENERGY e$^+$ - He SCATTERING}

P. Van Reeth and J.W. Humberston

Department of Physics and Astronomy,
University College London,
Gower Street, London WC1E 6BT, UK

The total  cross section
for  e$^+$ - He scattering is evaluated using the Kohn
variational method. Well converged results are obtained
and compared with experiment. A significant step-like
feature, which should be measurable experimentally,
is found at the positronium formation threshold.