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In this paper we study the single ionization of helium atoms by the impact of protons at intermediate energies. We present a continuum-distorted-wave-eikonal-initial-state calculation of the cross section doubly differential in the projectile scattering angle and the ionized electron energy. The internuclear interaction is incorporated by means of an eikonal phase approximation. This calculation includes a full account of the final-state interactions among the three collision partners, showingdoi:10.1103/physreva.57.215 fatcat:ihrx3yesgbb7jmm4aawj5wcloa