Scattering of light exotic atoms in excited states

The differential and total cross sections for the scattering of muonic, pionic, kaonic and antipro-tonic hydrogen in excited states from atomic hydrogen have been calculated for the purpose of atomic cascade calculations. The scattering problem is treated in a fully quantum mechanical framework which takes the energy shifts and, in the case of the hadronic atoms, the widths of the ns states into account. The validity of semiclassical approximations is critically examined. PACS. 34.50.-s Scattering of atoms and molecules – 36.10.-k Exotic atoms and molecules (containing mesons, muons, and other unusual particles)