SCATTERING-THEORY FORMULATION OF STOPPING POWERS OF A SOLID TARGET FOR PROTONS AND ANTIPROTONS WITH VELOCITY-DEPENDENT SCREENING

The scattering theory formulation of the stopping power of a homogeneo us electron gas is implemented by consistent velocity-dependent potent ials, which are needed to calculate transport cross sections for bare intruders. The method of volume averaging, over the Wigner-Seitz atomi c cell of a solid Al target, is employed to characterize inhomogeneiti es of the electronic system and define average stopping powers for cas es of protons and antiprotons. The theoretical results for average ene rgy losses of both projectiles are in remarkable agreement wi th recen t experimental data over a broad range of projectile velocities.