Erlangen 2026 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 15: Heavy-Ion Collisions and QCD Phases II
HK 15.1: Vortrag
Dienstag, 17. März 2026, 16:15–16:30, PHIL C 601
Flow phenomena at high nuclear densities with HADES — •Behruz Kardan for the HADES collaboration — Goethe-Universität, Frankfurt am Main
Heavy-ion collisions in the few-GeV energy range create strongly interacting matter at extreme baryon densities, comparable to those in neutron star mergers. Precise measurements of the dense-matter Equation-of-State in this regime are therefore essential for the understanding of neutron stars.
We present new results from HADES (High-Acceptance Dielectron Spectrometer) located at the SIS18, GSI Darmstadt, the only current setup capable of measuring rare and penetrating probes at the high-µB frontier of the QCD phase diagram.
High-statistics measurements of collective flow for protons and light nuclei are reported in Au+Au and Ag+Ag collisions at √sNN = 2.42 and 2.55 GeV, along with recent Au+Au data at √sNN = 1.98, 2.07, 2.16, and 2.24 GeV, extending the excitation function to lower beam energies (200 − 800 AMeV).
Beyond directed and elliptic flow, flow coefficients vn up to 6th order are measured for the first time in this energy range, enabling a 3D characterization of angular particle emission in momentum space. Furthermore, the event-by-event flow fluctuations can be explored via correlations between the different flow coefficients, providing even stronger constraints on the Equation-of-State, and will also be presented.
This work was supported by the Helmholtz Forschungsakademie HFHF and GSI F&E.
Keywords: Equation-of-state; Dense nuclear matter; Collective flow phenomena; Relativistic Nucleus Nucleus Collisions; QCD phase diagram