POSITRON SCATTERING BY He, Mg, Ca AND Zn
 C.P.Campbell+, Jennifer Blackwood+, Mary T.McAlinden++ 
and H.R.J.Walters+
+Department of Applied Mathematics, Queen's University,
Belfast BT7 1NN, UK.
++ School of Computing, Staffordshire University,
Beaconside, Stafford ST18 0DG, UK.
Positron scattering by He, Mg, Ca and Zn is treated in the 
coupled - pseudostate formalism using up to 36 atomic states
and positronium eigenstates up to Ps(n=3). Results will be 
presented for positronium formation, ionization, discrete 
excitation of the atom and total scattering.