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Cross sections and spin asymmetries for elastic positron scattering and forthe emission of positron bremsstrahlung in collision with nuclei of zero andhalf-integer spin are calculated within the relativistic partial-wave theory.For elastic scattering, comparison is made with the respective results fromelectron scattering by 208Pb, 89Y and 23Na nuclei at high energies (up to 400MeV). It is found that the difference between electron and positron intensitiesdiminishes with energy, although the diffraction oscillations, which differ inphase for the two species, prevail up to the highest energies considered.Magnetic scattering strongly reduces the spin asymmetries for nuclei with spin,both for positrons and electrons. For the elementary process of bremsstrahlungthe cross section, which is studied for the 197Au and 208Pb targets at lowenergies (1-30 MeV), increases with photon frequency for large scatteringangles and small photon emission angles, in contrast to the usual behaviour ofthe doubly differential cross section, or of the triply differential crosssection at small scattering angles.

Relativistic positron scattering from heavy ground-state nuclei