Distribution of positrons emitted from pair production with capture in relativistic heavy ion collisions

For incident projectile energies between 1 and 100 GeV amu -1 angular and energy differential cross sections for electron-positron pair production with simultaneous capture of the electron into the K shell of one of the colliding ions have been calculated. Within the framework of the plane-wave Born approximation (PWBA) the author compares the results using exact Coulomb-Dirac wavefunctions with those using approximate wavefunctions to describe the electron-positron pairs.