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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-24 22:07 |
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Conference: Bucharest University Faculty of Physics 2001 Meeting
Section: Nuclear and Elementary Particles Physics
Title:
BRAHMS Experiment. First experimental results
Invited lecture
Authors:
Alexandru JIPA
for BRAHMS Collaboration from RHIC-BNL
Affiliation:
Faculty of Physics, University of Bucharest
E-mail
Keywords:
Abstract:
The BRAHMS Experiment at the Relativistic Heavy Ion Collider (RHIC) from Brookhaven National Laboratory (USA) had as the main goal, for the first running year, the study of the general characteristics of the protons, pions and kaons yields in Au-Au collisions at . BRAHMS experiment was designed to gather information on the interesting physical quantities characterising the various emitted particles in heavy ion reactions as functions of transverse momenta, pT, and rapidity, y.
In BRAHMS experiment two different regimes are studied, namely: (i) a baryon poor region with a high energy density, created at mid-rapidity; (ii) a region near the initial nuclei, at high rapidities, very rich in baryons at relatively high temperature.
The yields as function of rapidity offer information on the nuclear density in the given collision, as well as on the produced entropy. The information on the collision dynamics and the thermalisation degree is obtained from the spectral shapes of the interesting physical quantities and their dependencies on rapidity. Important information on the collision dynamics is obtained from collision centrality measurements, and the information from the times in the reaction is included in the high pT part of the spectra.
The experimental set-up was designed with two moveable magnetic spectrometers, namely: (a) Forward Spectrometer (FS); (b) Mid Rapidity Spectrometer (MRS). To the two magnetic spectrometers three event characterisation detector systems haven been added; they will provide global information. The three detectors systems are the following: Beam-Beam counters, Multiplicity detector and Zero Degree Calorimeter.
The present work will present the major experimental results obtained by the collaboration on pseudorapidity and rapidity distributions, charged particle multiplicity, particle ratios, charged particle spectra and neutron spectra in ZDC. An analysis of the predicted and obtained results on acceptance and accuracy is done.
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