Based on the hydrodynamic approach, the formation of exotic structures in head-on heavy ion collisions at 60 MeV/nucleon is explained. The physical explanation of the different structures' formation with dependence on the incompressibility coefficient is suggested. Within the developed approach the Rayleigh-Plateau mechanism is confirmed to be the origin of the fragments in the case of "stiff" equation of state of nuclear matter (with an incompressibility of 380 MeV). The cold breakdown of the system is suggested to be caused by the presence of the Coulomb force. The obtained results are compared with the existing Boltzmann-like theory calculations and the experimental data for the "doughnut" -like geometries.
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