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Ionisation of helium by antiproton and proton impact

Single-electron ionisation of helium atoms by impact of antiprotons and protons is studied. The continuum-distorted-wave-eikonal-initial-state model is employed. Calculations of double differential cross sections, as a function of the final electron energy and for fixed electron-ejection angles, are given. A dip in the energetic region of electrons moving with low momentum with respect to the projectile is analysed. The importance of describing the dynamics of the electron in the simultaneous fields of the projectile and of the residual target is demonstrated.