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HK: Fachverband Physik der Hadronen und Kerne

HK 20: Physik mit schweren Ionen

HK 20.5: Talk

Tuesday, March 11, 2008, 09:45–10:00, 2E

Friction in abrasion — •Ville Föhr, Strahinja Lukic, Antoine Bacquias, Daniela Henzlova, Vladimir Henzl, Aleksandra Kelic, Maria Valentina Ricciardi, and Karl-Heinz Schmidt for the CHARMS collaboration — GSI, Darmstadt, Germany

Peripheral heavy-ion collisions at relativistic energies can be seen as a sudden cut-off of the projectile and target overlap zone. The non-overlapping zone, the so-called spectator region, is subjected to friction which is observed as a slowing down of the velocities of the projectile spectators. With the high-resolution magnetic spectrometer FRS we were able to determine the production cross sections of the fully identified fragments and to measure their velocities in the reaction ¹³⁶Xe (1 A GeV) + Pb. From this information we determined the impact parameter of the reaction from which they emerged. This method is based on the measured cross sections from which the impact parameter can be determined through Glauber calculation. Velocities of the projectile spectators are presented as a function of impact parameter with direct comparison to the predictions of theoretical models.