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HK: Physik der Hadronen und Kerne

HK 53: Physik mit schweren Ionen

HK 53.2: Group Report

Thursday, March 23, 2006, 17:30–18:00, D

Collective flow around the balance — •Jerzy Lukasik and Wolfgang Trautmann — GSI, Planckstr. 1, 64291 Darmstadt

Directed and elliptic flow has been studied using the Au+Au and Xe+Sn reactions at incident energies 40-150 AMeV, covering the transition regions for both v1 and v2. The reactions have been measured with the 4-pi multi-detector INDRA at the GSI facility. The existing methods of the correction for the reaction plane dispersion have been found inadequate at intermediate bombarding energies. A new method, taking advantage from both, directed and elliptic flow, and using the Gaussian approximation is proposed. The corrected excitation functions of v1 and v2 together with their system mass dependence, as well as the excitation function of the stopping observable are presented.