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INDRA@GSI: Collective Flow in Au+Au Collisions J. ̷Lukasik and W. Trautmann for the INDRA-ALADIN Collaboration

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Abstract

energies between 40 and 150 AMeV has been measured using the 4π multi-detector INDRA at the GSI facility. Measuring the collective flow observables is of continuous interest mainly due to their presumed link to the nuclear matter equation of state, momentum dependence of nuclear interactions, as well as to the in-medium nucleonnucleon cross section [1]. Directed flow can be conveniently characterized in terms of rapidity and possibly transverse momentum dependent Fourier coefficients [2, 3] extracted from the azimuthal distributions of the reaction products, measured with respect to the reconstructed reaction plane. In this representation the first two Fourier coefficients, v1 and v2, characterize the sideward and elliptic flow, respectively. to momentum conservation may lead to enhanced anticorrelation resulting in a flip of the orientation of the reaction plane. Thus, extraction of sideward flow in the vicinity of Ebal needs a special care, and possibly new methods of subtracting the non-flow correlations, such as e.g. the one suggested in [3] for high energy collisions. @ midrapidity 2

Year: 2011
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