The present paper provides a joint experimental and theoretical study of positron scattering from pyrazine. Experimental data were measured employing low-energy beamline, covered an energy range 1 to 79 eV. Cross sections for total scattering, elastic positronium formation, direct ionization, the sum discrete electronic-state excitation processes. In addition, electronic cross individual ${1}^{...

A scattering process with gravitons as an intermediate state is investigated. To study such a scattering, the Gravitoelectromagnetism theory considered. It gravitational built on analogy between gravity and electromagnetism. The complete Lagrangian formulation of gravitoelectromagnetic includes interactions fermions photons that leads us to calculate their amplitudes cross sections. In this con...

OF THE DISSERTATION A New Ultra-Cold Positron Beam and Applications To Low-Energy Positron Scattering and Electron-Positron Plasmas

Two-photon exchange contributions have potentially broad ranging impact on several charged lepton scattering measurements. Previously believed to be extremely small, based in part on comparisons of positron scattering and electron scattering in the 1950s and 1960s, recent data suggest that the corrections may be larger than expected, in particular in kinematic regions that were inaccessible in ...

This paper is a review of low-energy positron interactions with atoms and molecules. Processes of interest include elastic scattering, electronic and vibrational excitation, ionization, positronium formation and annihilation. An overview is presented of the currently available theoretical and experimental techniques to study these phenomena, including the use of trap-based positron beam sources...