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

• Verfasst von: Flörchinger, Stefan
• Verfasst von: Wetterich, Christof
• Titel: Chemical freeze-out in heavy ion collisions at large baryon densities
• Verf.angabe: Stefan Floerchinger, Christof Wetterich
• Umfang: 14 S.
• Titel Quelle: In: Nuclear physics <Amsterdam> / A
• Jahr Quelle: 2012
• Band/Heft Quelle: 890/891(2012), 1, S. 11-24
• ISSN Quelle: 1873-1554
• DOI: doi:10.1016/j.nuclphysa.2012.07.009
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1440751927

Abstract

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.