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Phys. Rev. A 75, 020703(R) (2007) [4 pages]

Gas-solid difference in charge-changing cross sections for bare and H-like nickel ions at 200 MeV∕u

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H. Ogawa1, H. Geissel2,3, A. Fettouhi2,3, S. Fritzsche4, M. Portillo5, C. Scheidenberger2, V. P. Shevelko6, A. Surzhykov7, H. Weick2, F. Becker2, D. Boutin2, B. Kindler2, R. K. Knöbel2,3, J. Kurcewicz8, W. Kurcewicz8, Yu. A. Litvinov2,3, B. Lommel2, G. Münzenberg2, W. R. Plaß3, N. Sakamoto1, J. Stadlmann2, H. Tsuchida1, M. Winkler2, and N. Yao2
1Department of Physics, Nara Women’s University, Nara 630-8506, Japan
2Gesellschaft für Schwerionenforschung GSI, Planckstraße 1, 64291 Darmstadt, Germany
3II. Physikalisches Institut, Justus-Liebig Universität Gießen, Heinrich-Buff-Ring 14, D-35392 Gießen, Germany
4Institut für Physik, University of Kassel, Heinrich-Plett-Strasse 40, D-34132 Kassel, Germany
5National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
6P.N. Lebedev Physical Institute, Leninski prospect 53, 119991 Moscow, Russia
7Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany
8Institute of Experimental Physics, Warsaw University, PL-00681 Warsaw, Poland

Received 7 October 2005; published 26 February 2007

It is well known that the density of the target can have a crucial impact on charge-changing collisions of partially ionized heavy ions. However, the basic understanding of this experimental observation is hampered by the difficulty in knowing the charge-state evolution of projectiles inside solids. Therefore, the present experiments with 200 MeV∕u bare and H-like nickel ions were performed to study charge-changing cross sections in different monatomic and compound gases and solids. The experimental results clearly demonstrate that the electron-loss cross sections in solids increase by about 40% compared to gases. The results support the Bohr-Lindhard model which predicts this gas-solid difference originating from enhanced ionization of excited ions. The experimental results are compared with recent theoretical estimates.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.75.020703
DOI:
10.1103/PhysRevA.75.020703
PACS:
34.70.+e
 
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