Single-quantum annihilation of positrons at low energies

Abstract

We discuss the single-quantum positron annihilation with a bound electron in the near threshold region. The angular distribution and the total cross section are considered. We obtain a simple analytical expression for the Coulomb potential and for the screened potential. It is worth noting that the obtained results for the screened potential are universal and independent of the explicit form of the atomic potential. It is shown that screening significantly increases the cross section. We also obtain the analogous results for bound-free $e^{+}{e}^{-}$ photoproduction.

9 pages, 3 figures

References in corpus (5)

• Pair production with electron capture in peripheral collisions of relativistic heavy ions
• Bound-free pair production cross section in heavy-ion colliders from the equivalent photon approach
• Angular distribution of high-energy $e^{+}{e}^{-}$ photoproduction close to the end of spectrum
• Photoproduction of $e^{+}{e}^{-}$ pair in a Coulomb field near the threshold
• Atomic screening and $e^{+}{e}^{-}$ pair photoproduction at low energies