Pair Conversion in Sub- and Supercritical Potentials

Abstract

We study the angular correlation of electrons and positrons which are emitted in internal pair conversion (IPC). This process is not only of interest in nuclear physics where our work supplements the early calculations of Rose [1] who employed the plane wave Born approximation. Since in different experiments at the Gesellschaft für Schwerionenforschung (GSI) two collaborations (ORANGE, EPOS) [2] have measured narrow peak structures in electron and positron spectra, the various pair creating processes have to be considered in more detail. The spectra are recorded in heavy-ion collisions with energies near the Coulomb barrier. The origin of these narrow lines is presently not understood although various explanations have been proposed [3].KeywordsAngular CorrelationNuclear ChargeBorn ApproximationCoulomb BarrierAnisotropy FactorThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.