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HK: Fachverband Physik der Hadronen und Kerne
HK 51: Structure and Dynamics of Nuclei IX
HK 51.3: Talk
Wednesday, March 30, 2022, 16:45–17:00, HK-H7
Towards solving the puzzle of high temperature light (anti)-nuclei production in ultra-relativistic heavy ion collisions — •Tim Neidig1, Carsten Greiner1, Kai Gallmeister2, Volodymyr Vovchenko3, and Marcus Bleicher1 — 1Institut for Theoretical Physics, Frankfurt am Main, Germany — 2nstitut for Theoretical Physics, Gießen, Germany — 3Lawrence Berkeley National Laboratory, Berkeley, USA
The creation of loosely bound objects in heavy ion collisions, e.g. light clusters, near the phase transition temperature (T ~ 155 MeV) has been a puzzling observation that seems to be at odds with Big Bang nucleosynthesis suggesting that deuterons and other clusters are formed only below a temperature T ~ 0.1-1 MeV. We showed that the light cluster abundancies in heavy ion reactions stay approximately constant from chemical freeze-out to kinetic freeze-out. To this aim we develop an extensive network of coupled reaction rate equations including stable hadrons and hadronic resonances to describe the temporal evolution of the abundancies of light (anti-)(hyper-)nuclei in the late hadronic environment of an ultrarelativistic heavy ion collision. However, because of the partial chemical equilibrium of the stable hadrons, including the nucleon feeding from resonances, the abundancies of the light nuclei stay nearly constant during the evolution and cooling of the hadronic phase and are in excellent agreement with those measured by ALICE at LHC.