POSITRONIUM PROTON-SCATTERING AT LOW ENERGIES

Calculations of law energy positronium-proton scattering using the clo se coupling approach are reported at energies below the three-body bre akup energy of 0.5 Rydberg. The channel space includes nine physical h ydrogen and positronium states and in addition twelve hydrogen and pos itronium pseudo-states. Total elastic and electron-transfer cross sect ions are reported at incident energies below the ionisation threshold. Cross sections for electron transfer to the H(n=2) and H(n=3) levels are also reported.