01.12.2016: Proiectul 34/2011 a fost finalizat cu succes. Obiectivele au fost indeplinite.

"Investigation of the quark gluon plasma formation and the freeze-out process in relativistic
nucleus-nucleus and proton-proton collisions"
Investigarea formarii plasmei de cuarci si gluoni si a procesului de "inghet" in ciocniri
nucleu-nucleu si proton-proton la energii relativiste.
Cod proiect: PN-II-ID-PCE-2011-3-0203, contract finantare nr. 34/2011, Ad. nr. 5/2016

Summary

The project studies the properties of nuclear matter in extreme conditions of temperature and density, away from the midrapidity region, at higher rapidities.In order to obtain new informations about the freeze-out process in a heavy ion collision at RHIC energies we will use the experimental data acquired with the BRAHMS experiment and study the changes in shape of the particle transverse momentum spectra as a function of rapidity,energy, system and collision centrality. We will use a Blast-Wave modelto extract the freeze-out variables (kinetic freeze-out temperature and collective transverse flow velocity). The particle ratios provide information on the system properties at chemical freeze-out. We will explore the rapidity dependence of the particle densities dN/dy and analyze the behavior of particle ratios in relation to rapidity, energy, collision centrality and collision symmetry to obtain information about the mechanisms of particle production, chemical (baryonic and strange) potential and possible restoration of chiral symmetry in the nuclear matter created in the collision. We will do simulations using the codes (HIJING, UrQMD) for the CBM experiment at FAIR accelerator and compare BRAHMS experimental data with simulated predictions to analyze the differences between matter produced at RHIC (small baryonic density, high temperature) and one that will be produced at FAIR (high baryonic density, moderate temperature).

Autoritatea Contactanta: Unitatea Executiva pentru Finantarea Invatamantului Superior, a Cercetarii, Dezvoltarii si Inovarii
Contractor: Facultatea de Fizica, Universitatea din Bucuresti
Director de proiect: Prof.univ.dr. Alexandru JIPA
Durata: 61 luni
Echipa de cercetare
Scientific report including the obtained rezults from the begining of the project till now

CENTRALIZATOR REZULTATE PUBLICATE IN ARTICOLE DIN REVISTE COTATE INTERNATIONAL



Etapa I an 2011
Etapa II an 2012
Etapa III an 2013
Etapa IV an 2014
Etapa V an 2015
Etapa VI an 2016

Synthesis of the existing experimental results obtained in nucleus-nucleus collisions at relativistic and ultrarelativistic energies, in agreement with the recent proposal for experimental signals of different phase transitions.
Obtaining new experimental results regarding the kinetic freeze-out for Au-Au, Cu-Cu and p-p collisions at RHIC available energies.
Obtaining new experimental results regarding the chemical freeze-out for Au-Au, Cu-Cu and p-p collisions at RHIC available energies.
New simulations using the best simulation codes (AMPT, UrQMD) for the CBM experiment at FAIR.
Examining the nuclear matter phase diagram including recent experimental results obtained at RHIC and LHC. Comparisons with similar simulations prediction.
Examining simulation predictions in order to know what to expect when the CBM experiment will from CBM in 2016.
A1. Searching interesting databases
A2. Selection of the proposed experimental signals and work for new proposals.		 A1. Getting transversal momentum spectra for each particle species (pions, kaons, protons and antiprotons) detected with BRAHMS experiment.
A2. Fitting the pT spectra with the Blast-wave function to obtain the kinetic freeze-out parameters.
A3. Study of the rapidity, collision centrality and energy dependence of the kinetic freeze-out parameters (kinetic freeze-out temperature and collective transverse flow velocity).		 A1. Investigation of behavior of particle ratios in relation to the rapidity, available energy, the symmetry of collisions and the centrality of the collision.
A2. Determination of chemical freeze-out parameters (chemical baryonic/strange potential and chemical freeze-out temperature) using the particle ratios.
A3. Study of the rapidity, collision centrality and energy dependence of the chemical baryonic potential and the possibility of chiral symmetry restoration in the produced nuclear matter.		 A1. Selection of the CBM Experiment detectors positions.
A2. Simulations with different codes, comparisons with results obtained in BRAHMS experiment.		 A1. RHIC and LHC experimental resuls analysis.
A2. New simulations for Fair-GSI and NICA-IUCN.
A3. Preliminary studies on the connections between simulation codes hypothesis, results from simulated data and predictions on the nuclear matter behaviour at FAIR-GSI eneregies.
 A1. The analyis of the differences between the nuclear matter obtained at RHIC (small barionic density, high temperature) and the one obtained in the future at FAIR (great barionic density, medium temperature)