Eur. Phys. J. D (2013) 67: 145
https://doi.org/10.1140/epjd/e2013-40095-4

Regular Article

Energy-loss straggling of 2−10 MeV/u Kr ions in gases

¹ Laboratory for Ion Beam Physics, ETH Zurich, 8093 Zurich, Switzerland
² Department of Physics, Chemistry and Biology, Linköping University, 581 83 Linköping, Sweden
³ Department of Physics, University of Jyväskylä, 40014 Jyväskylä, Finland
⁴ Donostia International Physics Center, 20018 San Sebastian, Spain
⁵ Department of Experimental Physics, Johannes Kepler University, 4040 Linz-Auhof, Austria
⁶ Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, 5230 Odense, Denmark
⁷ Present address: Department of Physics, University of Duisburg-Essen, 47048 Duisburg, Germany
⁸ Present address: Institut des Microtechnologies Appliquées Arc, Haute ÉcoleArc Ingénierie, 2300 La Chaux-de-Fonds, Switzerland

^a e-mail: sigmund@sdu.dk

Received: 22 February 2013
Received in final form: 25 March 2013
Published online: 18 July 2013

Abstract

Measurements have been performed on a time-of-flight setup at the Jyväskylä K130 cyclotron, aiming at energy-loss straggling of heavy ions in gases. Theoretical predictions based on recently developed theory as well as an empirical interpolation formula predict that straggling can be more than ten times higher than Bohr straggling in the MeV/u regime. Our measurements with up to 9.3 MeV/u Kr ions on He, N₂, Ne and Kr targets confirm this feature. Our calculations show the relative contributions of linear straggling, bunching including packing, and charge exchange. Our results for stopping cross sections are compatible with values from the literature.