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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:51 |
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Conference: Bucharest University Faculty of Physics 2011 Meeting
Section: Nuclear and Elementary Particles Physics
Title:
New estimations on the friction among participant region and spectator regions in nucleus-nucleus collisions at RHIC-BNL and FAIR-GSI energies
Authors:
A.Jipa, Andra Ibanescu*, C. Besliu, M. Calin, V. Covlea, T. Esanu, E. Stan, V. Baban, A. Scurtu, A. Barzu, S.Ciobanu, Ib. Abu-Quoad
Affiliation:
Atomic and Nuclear Physics Chair, Department of Structure of Matter, Atmospheric and Earth Physics, Astrophysics
Faculty of Physics, University of Bucharest, ROMANIA
E-mail
*ibanescu.ag@gmail.com
Keywords:
relativistic nuclear collisions dynamics, hydrodynamic models, friction and compression coefficients, calculations, comparisons with experimental results
Abstract:
For describing the relativistic and ultrarelativistic collisions dynamics different aspects are taken into account, which led to a large number of models. The nuclear matter obtained in such collisions is in very high densities and temperatures conditions, for time of the few tens Fm/c. The characterization of such states of the nuclear matter, as well as of the corresponding properties, can be done using various hypotheses on thermodynamic equilibrium (global equilibrium, in thermodynamic models, or local equilibrium, in hydrodynamic models). Considering that, many hydrodynamic models take into account the friction among participant region and spectator region(s), in this study a few attempts for calculation of compression and friction coefficients between the two types of regions for various nucleus-nucleus collisions, at energies between 4.5 A GeV (LS) and 200 A GeV (CMS) are done. For obtaining these results the collision geometry - determined by the impact factor and the degree of symmetry between the two colliding nuclei – was taken into account. As a preliminary result, it is noted that if the first quantity increases with the increase of the incident energy, the second decreases with this energy. These results could be correlated with the present experimental results of RHIC-BNL experiments, which announced the quark-gluon plasma formation in Au-Au collisions at 200 A GeV, in CMS.
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