Light-nuclei production in heavy-ion collisions within a thermodynamical approach

Abstract

We present results of simulations of light-nuclei production in relativistic heavy-ion collisions within updated Three-fluid Hydrodynamics-based Event Simulator Extended by UrQMD (Ultra-relativistic Quantum Molecular Dynamics) final State interactions (THESEUS). The simulations were performed for Pb+Pb and Au+Au collisions in the collision energy range of $\sqrt{s_{NN}}=$ 6.4--19.6 GeV. The light-nuclei production is treated within the thermodynamical approach on equal basis with hadrons. The only additional parameter related to the light nuclei is the energy density of late freeze-out that imitates afterburner stage of the collision because the light nuclei do not participate in the UrQMD evolution. This parameter is fixed from the condition of the best reproduction of the proton transverse-momentum spectrum after the UrQMD afterburner by that at the late freeze-out. The updated THESEUS results in not perfect, but a reasonable reproduction of data on bulk observables of the light nuclei, especially their functional dependence on the collision energy and light-nucleus mass. Various ratios, $d/p$, $t/p$, $t/d$, and $N(t)\times N(p)/N^2(d)$, are also considered. The directed flow of light nuclei turns out to be more involved. Apparently, it requires explicit treatment of the afterburner evolution of light nuclei that violates the kinetic equilibrium. Imperfect reproduction of the light-nuclei data leaves room for medium effects in produced light nuclei.

12 pages, 11 figures. Version published in PRC, discussion extended

References in corpus (20)

• Hypernuclei, dibaryon and antinuclei production in high energy heavy ion collisions: Thermal production vs. Coalescence
• Beam energy dependence of (anti-)deuteron production in Au+Au collisions at RHIC
• Phase transition dynamics for baryon-dense matter
• Centrality dependence of proton and antiproton spectra in Pb+Pb collisions at 40A GeV and 158A GeV measured at the CERN SPS
• Lattice QCD Constraints on the Nuclear Equation of State
• Directed Flow Indicates a Crossover Deconfinement Transition in Relativistic Nuclear Collisions
• Event simulation based on three-fluid hydrodynamics for collisions at energies available at the Dubna Nuclotron-based Ion Collider Facility and at the Facility for Antiproton and Ion Research in Darmstadt
• "Smashing more than two": Deuteron production in relativistic heavy ion collisions via stochastic multi-particle reactions
• Cluster and hyper-cluster production in relativistic heavy-ion collisions within the Parton-Hadron-Quantum-Molecular-Dynamics approach
• Dynamical Freeze-out in 3-Fluid Hydrodynamics
• Multiplicity Scaling of Light Nuclei Production in Relativistic Heavy-Ion Collisions
• Beam Energy dependence of Light Nuclei Production in Au+Au Collisions
• Coalescence, the thermal model and multi-fragmentation: The energy and volume dependence of light nuclei production in heavy ion collisions
• On freeze-out problem in relativistic hydrodynamics
• Hydrodynamical description of a hadron-quark first-order phase transition
• Light cluster production at NICA
• Effects of QCD critical point on light nuclei production
• Deuteron yields from LHC: Continuum correlations and in-medium effects
• Update of the Three-fluid Hydrodynamics-based Event Simulator: light-nuclei production in heavy-ion collisions
• Production characteristics of light (anti-)nuclei from (anti-)nucleon coalescence in heavy ion collisions at energies employed at the RHIC beam energy scan