Eur. Phys. J. D 46, 89-92 (2008)
https://doi.org/10.1140/epjd/e2007-00314-3

Antiproton and proton energy loss straggling at keV energies

¹ Institute for Storage Ring Facilities, University of Aarhus, 8000 Aarhus C, Denmark
² Department of Physics and Astronomy, University of Aarhus, 8000 Aarhus C, Denmark
³ Ørsted Laboratory, Niels Bohr Institute, Universitetsparken 5, 2100 København Ø, Denmark
⁴ Department of Physics and Chemistry, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark
⁵ Institut für Experimentalphysik, Johannes-Kepler-Universität, 4040 Linz-Auhof, Austria

Corresponding author: ^a ulrik@phys.au.dk

Received: 13 August 2007
Published online: 23 November 2007

Abstract

The slowing-down process of point-like charged particles in matter has been investigated by measuring the energy straggling for antiprotons and protons in Al, Ni and Au. A comparison with binary theory shows good agreement for Al and Au. For Ni, experimental data are not as convincing. In particular for the aluminum target, the Barkas-like effect of reduced energy straggling for antiprotons compared to protons is visible in the experimental data and a nearly velocity-proportional straggling is found, in good agreement with binary theory.