Abstract
It is argued that an irregularity in the baryon stopping is a natural consequence of the onset of deconfinement occurring in the compression stage of a nuclear collision. It is an effect of the softest point inherent in an equation of state (EoS) with a deconfinement transition. In order to illustrate this effect, calculations within the three-fluid model were performed with three different EoSs: a purely hadronic EoS, an EoS with a first-order phase transition and a third one with a smooth crossover transition. It is demonstrated that this irregularity is a very robust signal of the first-order phase transition that survives under acceptance conditions of the NICA MPD experiment.
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