D. Anchishkin, V. Vovchenko, L. P. Csernai
The space-time structure of the multi-pion system created in central relativistic heavy-ion collisions is investigated. With making use of the microscopic transport model "Ultra-relativistic Quantum Molecular Dynamics" we determine the freeze-out hypersurface from equation on pion density n(t,r)=n_c. It turns out that for proper value of the critical energy density epsilon_c equation epsilon(t,r)=epsilon_c gives the same freeze-out hypersurface. It is shown that for big enough collision energies E > 40A GeV/c (sqrt{s} > 8A GeV/c) the multi-pion system at a time moment tau ceases to be one connected unit but splits up into two separate spatial parts (drops), which move in opposite directions from one another with velocities which approach the speed of light with increase of collision energy. This time, tau, is approximately invariant of the collision energy.
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http://arxiv.org/abs/1211.1927
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