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DY: Dynamik und Statistische Physik

DY 46: Poster

DY 46.80: Poster

Donnerstag, 29. März 2001, 15:45–18:15, Foyer S\ 3

Multifragmentation of molecular cluster and percolation transition : a quantitative comparison — •Michel Farizon¹, Franck Gobet¹, Bernadette Farizon¹, Michel-Jean Gaillard¹, Jean-Paul Buchet², Michel Carré², Paul Scheier³, and Tilmann Märk³ — ¹Institut de Physique Nucléaire de Lyon, 43 boulevard du 11 Novembre 1918, F-69622 Villeurbanne Cedex, France — ²Laboratoire de Spectrométrie Ionique et Moléculaire, 43 boulevard du 11 Novembre 1918, F-69622 Villeurbanne Cedex, France — ³Institut für Ionenphysik, Leopold Franzens Universität, Technikerstr.25, A-6020 Innsbruck, Austria

Using a recently developed multi-coincidence technique, the cluser fragmentation resulting from a collision between a high energy H₂₇⁺ ion with a He target is investigated on an event by event basis. The data obtained are analysed in terms of fluctuations in the fragment size distribution. A comparison with results from two different 3D lattice bond percolation models of the same size (27 constituents) indicates the presence of a critical behaviour in the decaying finite system and the importance of accounting in the percolation model for the specific binding situation in the hydrogen cluster ion.