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München 2004 – scientific programme

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A: Atomphysik

A 13: Ion-Atom/Molekuel/Ion-Stoesse

A 13.5: Talk

Thursday, March 25, 2004, 12:00–12:15, HS 132

Charge-Exchange Cross Sections and the Gas-Solid Effect — •Andrè Fettouhi1,2, Franck Becker1, David Boutin1, Hans Geissel1,2, Ronja Knöbel2, Jan Kurcewicz3, Yuri Litvinov1, Hidemi Ogawa4, Mauricio Portillo1, Christoph Scheidenberger1,2, Jens Stadlmann1, Helmut Weick1, Martin Winkler1,2, and Nan Yao1,21Gesellschaft für Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, Germany — 2II. Physikalisches Institut, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 16, D-35392 Gießen, Germany — 3Institute of Experimental Physics, Warsaw University, PL-00-681 Warsaw, Poland — 4Department of Physics, Nara Women’s University, Kitauoya-Nishimachi, Nara 630-8506, Japan

It has been known for some time now that the gas-solid effect in charge exchange cross sections arises from differences in the mean free path length. In a gas the mean free path length is usually 1 order of magnitude larger than in solids. With the Fragment Separator at GSI we investigated this effect with Ni27+ and Ni28+ ions penetrating through various solids and gases at 200 MeV/u. At this energy the ionization cross section is much larger than that of capture, making it possible to study the effect by comparing the fully stripped and H-like Ni ions. The results of the experimental data are presented, along with a short note on the Zt-dependence of the cross sections.

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