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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:18 |
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Conference: Bucharest University Faculty of Physics 2001 Meeting
Section: Nuclear and Elementary Particles Physics
Title:
UrQMD predictions for Au-Au collisions at using BRAHMS experimetal set-up
Authors:
BRAHMS Collaboration from RHIC-BNL
and
Oana CÂ?U, Oana CULEA, Gabriel TABAN, Emil STAN, Marius RUS
Affiliation:
Atomic and Nuclear Physics Department, Faculty of Physics, University of Bucharest, ROMANIA
E-mail
Keywords:
Abstract:
Ultra-Relativistic Quantum Molecular Dynamics Model is a microscopic transport model that describes the phenomenology of hadronic interactions. At low and intermediate energies ( <5 GeV) the interaction is described in terms of interactions between known hadrons and their resonances. At higher energies, >5 GeV, the excitation of color strings and their subsequent fragmentation into hadrons dominates the multiple production of particles. This simulation code offers the possibility to study the time evolution of the system created after collision.
Using the UrQMD simulations we studied the total multiplicity as well as , , , , and multiplicities overall and also at –2.25.6, covered by the BRAHMS detectors. We also determined the / , / , / , / ratios and we compared them with results from HIJING simulations and some experimental data for BRAHMS interesting rapidity and pseudorapidity ranges. We calculated that 9 % of all collisions are central collisions with the impact parameter b < 3 Fm, in agreement with HIJING predictions. We analyzed the transverse momentum spectra and we determined the average transverse momentum < >. We studied the longitudinal momentum spectra and we found that for central collisions the number of spectator nucleons is very small and for the peripheral collisions (3
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