Frankfurt 2006 – wissenschaftliches Programm
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A: Atomphysik
A 7: Wechselwirkung von Materie mit Ionen
A 7.6: Vortrag
Dienstag, 14. März 2006, 15:45–16:00, H7
Charge state and energy loss by highly charged- decelerated heavy ions under crystal channeling conditions — •Angela Bräuning-Demian1, Fritz Bosch1, Harald Bräuning2, Michel Chevallier3, Camille Cohen4, Denis Dauvergne3, Alexander Gumberidze1, Alain LHoir4, Robert Kirsch3, Christophor Kozhuharov1, Dieter Liesen1, Paul Mokler1, Jean-Claude Poizat3, Cedric Ray3, Jean-Pierre Rozet4, Thomas Stöhlker1, Etienne Testa3, Marcel Toulemonde5, and Punita Verma1 — 1GSI , 64291 Darmstadt, Germany — 2Institut für Atom- und Molekülphysik, Justus-Liebig Universität, 35392 Giessen, Germany — 3Institut de Physique Nucleaire de Lyon, 69622 Villeurbanne cedex, France — 4GPS, Universites Paris VI-Paris VII, 75251 Paris cedex 05, France — 5CIRIL, 14040 Caen cedex, France
Ions channeled in a crystal are repelled by the aligned target atoms. Thus their interaction with matter is dominated by collisions at large impact parameter with the atoms, and to close collisions with the valence electron gas. The use of highly-charged, decelerated heavy ions such as U91+ ions at energies below 20 MeV/u leads to specific features for charge exchange and energy loss under channeling conditions. In particular, although these ions sample a reduced electron density, their energy loss rate is very high, due to the dependence of the stopping force on the square of the ion charge state Q. This contribution will report on recent results obtained at GSI.