Positron Annihilation In Xe Atoms

Abstract

Positronium formation as a three-body reaction. I. The second-order positron-electron interaction amplitude Abstract. The annihilation parameters Z eff of positrons in xenon atoms are calculated. The elastic cross sections for positron scattering from Xe atoms reported at low energy, below positronium (Ps) formation threshold. The bound wavefunctions of electrons are generated from Cowan program. The least-squares variational method (LSVM ) is used for determining the scattering wavefunction. The present results of annihilation parameters and cross sections are consisted with simiemprical and other theoretical results.

Variational calculation of low-energy positron life time in Xe atoms

“…The least squares variational method was applied to low energy positron scattering from H, He [17] ,Ar [18], and Kr [19]. It was applied to obtain the wave function of the continuum Auger electron emitted from an ionized Ne atom [20] and developed to study positron-H molecules scattering [21].…”