Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-04-09
Phys.Rev.C78:014907,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, REVTEX
Scientific paper
10.1103/PhysRevC.78.014907
Two microscopic models, UrQMD and QGSM, were employed to study the formation of locally equilibrated hot and dense nuclear matter in heavy-ion collisions at energies from 11.6 AGeV to 160 AGeV. Analysis was performed for the fixed central cubic cell of volume V = 125 fm**3 and for the expanding cell which followed the growth of the central area with uniformly distributed energy. To decide whether or not the equilibrium was reached, results of the microscopic calculations were compared to that of the statistical thermal model. Both dynamical models indicate that the state of kinetic, thermal and chemical equilibrium is nearly approached at any bombarding energy after a certain relaxation period. The higher the energy, the shorter the relaxation time. Equation of state has a simple linear dependence P = a(sqrt{s})*e, where a = c_s**2 is the sound velocity squared. It varies from 0.12 \pm 0.01 at E_{lab} = 11.6 AGeV to 0.145 \pm 0.005 at E_{lab} = 160 AGeV. Change of the slope in a(sqrt{s}) behavior occurs at E_{lab} = 40 AGeV and can be assigned to the transition from baryon-rich to meson-dominated matter. The phase diagrams in the T - mu_B plane show the presence of kinks along the lines of constant entropy per baryon. These kinks are linked to the inelastic (i.e. chemical) freeze-out in the system.
Arsene Ionut
Bleibel J.
Bleicher Marcus
Bravina Larissa
Burau Gerhard
No associations
LandOfFree
Microscopic models and effective equation of state in nuclear collisions at FAIR energies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Microscopic models and effective equation of state in nuclear collisions at FAIR energies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microscopic models and effective equation of state in nuclear collisions at FAIR energies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-574828