Eur. Phys. J. D (2014) 68: 318
https://doi.org/10.1140/epjd/e2014-50461-3

Regular Article

Notes on Barkas-Andersen effect

¹ Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, 5230 Odense M, Denmark
² Institut für Experimentalphysik, Johannes Kepler Universität, 4040 Linz-Auhof, Austria

^a e-mail: sigmund@sdu.dk

Received: 18 June 2014
Received in final form: 8 August 2014
Published online: 28 October 2014

Abstract

Stimulated by recent statements in the literature on electronic stopping of heavy ions in matter, we try to clarify some central theoretical aspects of the Barkas-Andersen effect, about which there does not seem to be unanimous agreement in the community. We address the role of inner versus outer target shells, of projectile screening by bound electrons, the interference between Lindhard’s description and perturbation theory, as well as the equivalence between a single-electron versus Fermi-gas description of the effect.