Abstract
The classical trajectory Monte Carlo method was applied to the description of the fragmentation of the positronium (Ps) in collision with He atoms. The collision system was simplified to a three-body system consisting of the electron and the positron of the Ps, as well as the He atom that was considered as a structureless particle. The interaction of the ${e}^{\ensuremath{-}}$ and ${e}^{+}$ with the He was approximated by a static, fully screened Coulomb potential. The calculations were carried out for collision energies 13, 18, 25, and 33 eV. The obtained total break-up cross sections and the longitudinal energy distributions of the emitted positrons were compared with the recent experimental results of Armitage et al. [Phys. Rev. Lett. $89,$ 173402 (2002)]. The present theory overestimates the measured cross sections by a factor of 1.6--2.5, but it correctly reproduces the peak found by Armitage et al. in the positron spectra at about half of the residual Ps energy.
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