ИСТИНА

The correlation femtoscopy allows the measurement of the space-time characteristics of particle production processes due to the effects of quantum statistics and final state interactions. The main features of the femtoscopy measurements in heavy-ion collisions at high energies are understood as a manifestation of the strong collective flow and well interpreted within hydrodynamic models with crossover phase transition. The femtoscopy at lower energies was intensively studied at AGS, SPS and now in the Beam Energy Scan program. We discuss the possibilities to observe the change from the first order phase transition expected at low energies to the crossover one at high energies with the femtoscopy observables using cascade and hybrid models.