Bonn 2020 – wissenschaftliches Programm
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HK 43.4: Vortrag
Donnerstag, 2. April 2020, 15:00–15:15, J-HS F
Nucleosynthesis in heavy-ion collisions at the LHC via the Saha equation — Volodymyr Vovchenko1,2, •Kai Gallmeister1, Jürgen Schaffner-Bielich1 und Carsten Greiner1 — 1Institut für Theoretische Physik, Goethe Universität, Frankfurt/Main — 2Frankfurt Institute of Advanced Studies, Frankfurt/Main
The production of light (anti-)(hyper-)nuclei in heavy-ion collisions at the LHC is considered in the framework of the Saha equation, making use of the analogy between the evolution of the early universe after the Big Bang and that of “Little Bangs” created in the lab.
Assuming that disintegration and regeneration reactions involving light nuclei proceed in relative chemical equilibrium after the chemical freeze-out of hadrons, their abundances are determined through the famous cosmological Saha equation of primordial nucleosynthesis and show no exponential dependence on the temperature typical for the thermal model.
A quantitative analysis, performed using the hadron resonance gas model in partial chemical equilibrium, shows agreement with experimental data of the ALICE collaboration on
d, 3He, Λ3H, and 4He
yields for a very broad range of temperatures at T 155 MeV.
The presented picture is supported by the observed suppression of
resonance yields in central Pb–Pb collisions at the LHC.
Supported by BMBF.