München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 21: Postersitzung

HK 21.39: Poster

Dienstag, 21. März 2006, 15:30–17:00, P

Critical charge fluctuations in spectator fragmentation — •Wolfgang Trautmann — GSI Darmstadt, Planckstr. 1, 64291 Darmstadt

The fluctuations of the largest fragment-charge of a partition and of the asymmetries of the two or three largest fragments in peripheral 197Au +197Au collisions at 1000 MeV per nucleon are investigated. The observed bimodal distributions at particular values of the sorting variable Zbound exhibit features known from percolation theory where they appear as finite-size effects. In classical molecular dynamics bimodal distributions are observed near the critical percolation line known from lattice gas theory.