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We present an update of the event generator based on the three-fluid dynamics(3FD), complemented by Ultra-relativistic Quantum Molecular Dynamics (UrQMD)for the late stage of the nuclear collision~-- the three-fluidHydrodynamics-based Event Simulator Extended by UrQMD final State interactions(THESEUS). Two modifications are introduced. The THESEUS table of hadronicresonances is made consistent with that of the underlying 3FD model. The mainmodification is that the generator is extended to simulate the light-nucleiproduction in relativistic heavy-ion collisions, on the equal basis withhadrons. These modifications are illustrated by applications to the descriptionof available experimental data. The first run of the updated generator revealeda good reproduction of the NA49 data on the light nuclei. The reproduction isachieved without any extra parameters, while the coalescence approach in 3FDrequires special tuning of the coalescence coefficients for each light nucleusseparately.

Update of the Three-fluid Hydrodynamics-based Event Simulator: light-nuclei production in heavy-ion collisions