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Equilibrium and non-equilibrium effects in nucleus - Nucleus collisions

Publication ,  Journal Article
Bravina, LV; Gorenstein, MI; Zabrodin, EE; Bass, SA; Belkacem, M; Bleicher, M; Brandstetter, M; Hofmann, M; Soff, S; Spieles, C; Weber, H ...
Published in: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
January 1, 1999

Local thermal and chemical equilibration is studied for central A + A collisions at 10.7-160 AGeV in the Ultrarelativistic Quantum Molecular Dynamics model (UrQMD). The UrQMD mode exhibits strong deviations from local equilibrium at the high density hadron-string phase formed during the early stage of the collision. Equilibration of the hadron-resonance matter is established in the central cäl of volume V = 125 fmat later stages, t > 10 fm/c, of the resulting quasi-isentropic expansion. The thermodynamical functions in the cell and their time evolution are presented. Deviations of the UrQMD quasi-equilibrium state from the statistical mechanics equilibrium are found. They increase with energy per baryon and lead to a strong enhancement of the pion number density as compared to statistical mechanics estimates at SPS energies. ©1999 Published by Elsevier Science B.V. All rights reserved.

Duke Scholars

Published In

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

DOI

ISSN

0370-2693

Publication Date

January 1, 1999

Volume

459

Issue

4

Start / End Page

660 / 666

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
  • 0105 Mathematical Physics
 

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Bravina, L. V., Gorenstein, M. I., Zabrodin, E. E., Bass, S. A., Belkacem, M., Bleicher, M., … Greiner, W. (1999). Equilibrium and non-equilibrium effects in nucleus - Nucleus collisions. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 459(4), 660–666. https://doi.org/10.1016/S0370-2693(99)00692-9
Bravina, L. V., M. I. Gorenstein, E. E. Zabrodin, S. A. Bass, M. Belkacem, M. Bleicher, M. Brandstetter, et al. “Equilibrium and non-equilibrium effects in nucleus - Nucleus collisions.” Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 459, no. 4 (January 1, 1999): 660–66. https://doi.org/10.1016/S0370-2693(99)00692-9.
Bravina LV, Gorenstein MI, Zabrodin EE, Bass SA, Belkacem M, Bleicher M, et al. Equilibrium and non-equilibrium effects in nucleus - Nucleus collisions. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 1999 Jan 1;459(4):660–6.
Bravina, L. V., et al. “Equilibrium and non-equilibrium effects in nucleus - Nucleus collisions.” Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 459, no. 4, Jan. 1999, pp. 660–66. Scopus, doi:10.1016/S0370-2693(99)00692-9.
Bravina LV, Gorenstein MI, Zabrodin EE, Bass SA, Belkacem M, Bleicher M, Brandstetter M, Hofmann M, Soff S, Spieles C, Weber H, Stöckerand H, Greiner W. Equilibrium and non-equilibrium effects in nucleus - Nucleus collisions. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 1999 Jan 1;459(4):660–666.
Journal cover image

Published In

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

DOI

ISSN

0370-2693

Publication Date

January 1, 1999

Volume

459

Issue

4

Start / End Page

660 / 666

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
  • 0105 Mathematical Physics