Light-nuclei production in Au plus Au collisions at √sNN=3 GeV within a thermodynamical approach: Bulk properties and collective flow

We present results of simulations of light -nuclei production in Au + Au collisions at a collision energy of root sNN = 3 GeV within the updated Three -fluid Hydrodynamics -based Event Simulator Extended by UrQMD (ultrarelativistic quantum molecular dynamics) final State interactions (THESEUS). The results are compared with recent STAR data. The light -nuclei production is treated within the thermodynamical approach on an equal basis with hadrons. The only additional parameter related to the light nuclei is the energy density of late freezeout that imitates the afterburner stage of the collision because the light nuclei do not participate in the UrQMD evolution. It is found that the late freeze -out is preferable for deuterons, tritons, and 3He. Remarkably, the 4He observables are better reproduced with the standard freeze -out. This suggests that the 4He nuclei better survive in the afterburner stage because they are more spatially compact and tightly bound objects. This is an argument in favor of dynamical treatment of light nuclei. The simulations indicate that the collision dynamics is determined by the hadronic phase. The calculated results reveal a not perfect, but good reproduction of the data on bulk observables and directed flow. The elliptic flow turns out to be more intricate.