  In this work we propose a non-perturbative approximation to the electronic
stopping power based on the central screened potential of a projectile moving
in a free electron gas, by Nagy and Apagyi. We used this model to evaluate the
energy loss of protons and antiprotons in ten solid targets: Cr, C, Ni, Be, Ti,
Si, Al, Ge, Pb, Li and Rb. They were chosen as canonicals because they have
reliable values of the Seitz radio, rS=1.48-5.31 a.u., which cover most of the
possible metallic solids. Present low velocity results agree well with the
experimental data for both proton and antiproton impact. Our formalism
describes the binary collision of the projectile and one electron of the free
electron gas. It does not include the collective or plasmon excitations, which
are important in the intermediate to high velocity regime. The distinguishing
feature of this contribution is that by using the present model for low to
intermediate energies (below the appearance of plasmon excitations), the
Lindhard dielectric formalism (including plasmons) for intermediate to high
energies, and the shellwise local plasma approximation to account for the inner
shell contribution, then a good full-theoretical description of the available
experimental data is obtained in an extensive energy range, covering the low,
intermediate and high energy region.
