Chemical freeze-out in heavy ion collisions at large baryon densities

Details Chemical freeze-out in heavy ion collisions at large baryon densities Chemical freeze-out in heavy ion collisions at large baryon densities

2012-02-08

arxiv.org/abs/1202.1671v1

Physics

Nuclear Physics

Nuclear Theory

7 pages, 9 figures

Scientific paper

We argue that the chemical freeze-out in heavy ion collisions at high baryon density is not associated to a phase transition or rapid crossover. We employ the linear nucleon-meson model with parameters fixed by the zero-temperature properties of nuclear matter close to the liquid-gas quantum phase transition. For the parameter region of interest this yields a reliable picture of the thermodynamic and chiral properties at non-zero temperature. The chemical freeze-out observed in low-energy experiments occurs when baryon densities fall below a critical value of about 15 percent of nuclear density. This region in the phase diagram is far away from any phase transition or rapid crossover.

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