Flow correction for 1.23 A GeV Au+Au collisions at the HADES experiment

Heavy ion collisions at energies of few A GeV, delivering an information about highly compressed matter under conditions similar to those inside neutron stars, are characterised by very high nuclei stopping. In particular circumstances this phenomenon can lead to affection of source expansion and impeded particle reconstruction results.
The HADES detector is a large acceptance spectrometer for fixed target collisions, operating with heavy ion beams about 1-2 A GeV kinetic energy, delivered by SIS18 accelerator. It was designed mostly for detecting dileptons, produced in light vector meson decays.
The following presentation presents an analysis of Au+Au collisions at 1.23 AGeV, measured by the HADES experiment, performed in order to study a detector effects related to increased local phase space occupancy as a succession of low collision energy and high system’s mass. For this purpose the spectra of flow was investigated. Their distributions have been studied in terms of deviations caused by occupancy-related effects, lading to creating a correction method, developed to overcome the data distortion.