Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 45: Postersession
HK 45.48: Poster
Mittwoch, 16. März 2016, 18:30–20:30, S1/05 22-24
Collective flow in heavy-ion collisions at Elab = 1−2A GeV — •Markus Mayer1,2, Longgang Pang2, Dmytro Oliinychenko1,3, and Hannah Petersen1,2,4 — 1Frankfurt Institute for Advanced Studies — 2Goethe Universität Frankfurt — 3Bogolyubov Institute for Theoretical Physics — 4GSI Helmholtzzentrum für Schwerionenforschung
Collective flow represents an important opportunity to gain information about the characteristics of the fireball and insights about the equation of state. Flow can be analyzed by considering the momentum distribution of the particles which are emitted from the fireball. Collective flow is composed of radial flow and an azimuthally asymmetric expansion, the latter is corresponding to the anisotropic flow. In non-central collisions the fireball corresponds to an almond-shaped overlap area of the participants, which results in the anisotropic flow. The largest contributions to this anisotropic flow are provided by the elliptic and the directed flow. When the speed of the spectators is lower than the rate of expansion of the fireball, they block the emission of particles from the fireball. Hence the particles are squeezed out of the almond shape. In central collisions the fireball is circular resulting in a radial flow of matter. These flow-effects can be analyzed by investigating v1 and v2 as a function of the transverse momentum or the rapidity. In this work, the collective flow of nucleons and pions is studied within a hadronic transport approach at beam energies of 1−2A GeV.