Classical-trajectory Monte Carlo calculations have been used to study ionizing collisions between charged particles (p,p»,e+,e-) and He atoms at an incident velocity of 2.83 a.u. While differences in the total single-ionization cross sections for these projectiles are small, our calculations reveal large effects at all angles in the ionized electron spectra and provide qualitative evidence for a Barkas effect in p and p» collisions. Experimental data agree well with our fully classical calculations, including cross sections involving ejected electrons of long wavelength. © 1988 The American Physical Society.
R. E. Olson and T. J. Gay, "Dynamics Of Antimatter-atom Collisions," Physical Review Letters, vol. 61, no. 3, pp. 302 - 305, American Physical Society, Jan 1988.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.61.302
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01 Jan 1988