3 years ago

# Fragmentation region in heavy-ion collisions at $\sqrt{s_{NN}}=$ 39 GeV.

A. A. Soldatov, Yu. B. Ivanov

Baryon and energy densities reached in the fragmentation regions in central Au+Au collisions at collision energy of $\sqrt{s_{NN}}=$ 39 GeV are estimated within the model of the three-fluid dynamics. It is shown that the final fragmentation regions are formed out of not only "true" fragmentation fireballs, i.e. the baryon-rich matter passed through the interaction region, but also of the baryon-rich regions of the central fireball pushed out to peripheral rapidities. The initial thermalized mean proper baryon and energy densities approximately are $n_B/n_0 \approx$ 10 and $\varepsilon\approx$ 40 GeV/fm$^3$, respectively. Though these high densities are mainly formed in the central fireball, their consequences should be observed in the fragmentation regions where this dense matter is pushed out by the subsequent almost 1D expansion of the central fireball along the beam direction.

Publisher URL: http://arxiv.org/abs/1711.03069

DOI: arXiv:1711.03069v1

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