Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 30: Heavy Ion Collisions and QCD Phases VII

HK 30.4: Talk

Wednesday, March 29, 2017, 17:45–18:00, F 3

Freeze-out parameters of hadrons produced in Au+Au collisions at 1.23A GeV — •Heidi Schuldes for the HADES collaboration — Goethe-Universität Frankfurt

0pt The collective motion of final state hadrons reveals important information about both, the properties of the hot and dense medium created in a heavy-ion collision and the collision dynamics. The HADES collaboration has measured a comprehensive set of hadrons (p, d, π^±, K^±, K⁰, φ, Λ) produced in Au+Au collisions at 1.23A GeV.

The inverse slope parameters of the transverse mass spectra assuming a static thermal source show a mass dependent rise, indicating an additional radial expansion of the fireball. In this contribution we investigate the kinetic freeze-out conditions by applying simultaneous blast wave fits to the transverse mass spectra of hadrons and discuss to which extent the assumption of global freeze-out parameters can describe the observed kinematics. These results are compared to the chemical freeze-out parameters obtained by fitting the measured particle yields with a statistical hadronization model. Furthermore, the influence of resonance decays on the measured particle spectra will be addressed.

This work has been supported by BMBF (05P15RFFCA), GSI and HIC for FAIR.