Erlangen 2026 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 24: Heavy-Ion Collisions and QCD Phases IV
HK 24.6: Talk
Wednesday, March 18, 2026, 15:15–15:30, PHIL A 401
Proton and light nuclei yields and E-by-E fluctuations measured at HADES — •Marvin Nabroth — Goethe-University Frankfurt
Low energy heavy-ion collisions in the 1 AGeV regime, as studied by the HADES experiment at SIS18/GSI, allow to probe QCD matter under highest net-baryon densities and moderate temperatures.
In this contribution we present refined efficiency corrected transverse and longitudinal yield spectra of protons, deuterons, tritons, He3 reconstructed from Ag+Ag collisions at √sNN = 2.55 GeV and √sNN = 2.42 GeV measured at HADES in 2019. We discuss the spectral shape properties and the coalescence behavior as a function of centrality, as well as the beam-energy dependence. These results contribute to a better understanding of the formation of light nuclear clusters, and help constrain the freeze-out conditions via thermal-model fits.
Furthermore, we present an update of the analysis of higher order moments of the e-by-e fluctuations of the proton yields in different rapidity windows. Such fluctuation observables are essential for exploring signs of criticality expected from the conjectured first-order phase transition or critical end point.
This work has been supported by BMBF (05P21RFFC2, 05H24RF5), GSI and HGS-Hire.
Keywords: HADES; heavy-ion collisions; high net-baryon density; proton and light nuclei; e-b-y fluctuations