Nonperturbative and relativistic effects in projectile-electron loss in relativistic collisions with atomic targets

We calculate projectile-electron loss cross sections in ultrarelativistic collisions with neutral atomic targets. To this end we employ the first-order perturbation theory and the eikonal approximation. We show that, in general, the following main effects should be included for a proper description of the projectile-electron loss in ultrarelativistic collisions: (i) the shielding effects of electrons of the neutral target, (ii) the relativistic effects in the motion of the electron in the projectile for heavy projectiles, and (iii) the nonperturbative effects in collisions with heavy targets, especially for light projectiles.

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