Pionic freeze-out hypersurfaces in relativistic nucleus-nucleus collisions
Pionic freeze-out hypersurfaces in relativistic nucleus-nucleus collisions
The space-time structure of the multipion system created in central relativistic heavy-ion collisions is investigated. Using the microscopic transport model UrQMD we determine the freeze-out hypersurface from the equation on pion density $n(t,\phantom{\rule{0.16em}{0ex}}\mathbf{r})={n}_{c}$. It turns out that for proper value of the critical energy density ${\ensuremath{\epsilon}}_{c}$ equation $\ensuremath{\epsilon}(t,\phantom{\rule{0.16em}{0ex}}\mathbf{r})={\ensuremath{\epsilon}}_{c}$ gives the …