# Electron exchange model potential: Application to positronium-helium scattering

Source: [Electron exchange model potential: Application to positronium-helium scattering](<https://www.sota2.com/research/paper/68fa34551e209131ce8983ed>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T20:37:30.765Z

Authors: P. K. Biswas, Sadhan K. Adhikari

Published: 1999-11-23T16:12:39.000Z

## Abstract

The formulation of a suitable nonlocal model potential for electron exchange is presented, checked with electron-hydrogen and electron-helium scattering, and applied to the study of elastic and inelastic scattering and ionization of ortho positronium (Ps) by helium. The elastic scattering and the $n = 2$ excitations of Ps are investigated using a three-Ps-state close-coupling approximation. The higher ($n\\ge 3$) excitations and ionization of Ps atom are treated in the framework of Born approximation with present exchange. Calculations are reported of phase shifts, and elastic, Ps-excitation, and total cross sections. The present target elastic total cross section agrees well with experimental results at thermal to medium energies.

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/physics/9911052>)

[PDF](<https://arxiv.org/pdf/physics/9911052.pdf>)