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Conference: Bucharest University Faculty of Physics 2015 Meeting

Section: Nuclear and Elementary Particles Physics II

Title:

CBM Experiment at FAIR-GSI: possible correlations and fluctuations in particle emission

Authors:

Alexandru JIPA(1), Oana RISTEA(1), Catalin RISTEA(2,1), Marius CALIN(1), Ionel LAZANU(1), Calin BESLIU(1), Dan ARGINTARU(3), Valerica BABAN(3), Tiberiu ESANU (4,1), Nicolae George TUTURAS(1)

Affiliation:

(1) Faculty of Physics, University of Bucharest

(2) Institute of Space Science Bucharest-Magurele

(3) University of Civil Marine Constantza

(4) National Institute of Physics and Nuclear Engineering "Horia Hulubei" Bucharest-Magurele

E-mail

jipa@brahms.fizica.unibuc.ro

Keywords:

CBM, FAIR, SIS-100, SIS-300, particle emission, correlations, fluctuations, nuclear dynamics, phase transitions

Abstract:

The phase diagram of nuclear matter has still parts uncovered by the experimental results for interesting physical quantities. Therefore, the international scientific community from the field of the Relativistic Heavy Ion Physics decided to cover these. In this sense, two ways have been selected, namely: increasing of the energy and/or atomic numbers at the existing systems of accelerators (RHIC-BNL, SPS, LHC-CERN), the building of new systems of accelerators, respectively. One of the proposed systems of accelerators is the Facility of Antiproton and Ion Research (FAIR) from GSI Darmstadt (Germany). In present, two connected synchrotrons have been proposed: SIS-100, SIS-300, respectively. These accelerators can accelerate ions up to 45 A GeV having atomic numbers up to lead. A few experimental set-ups have been proposed for this new facility. One of these is the Compressed Baryonic Matter (CBM) Experiment. The authors of the work, as members of the CBM Collaboration worked for obtaining some confidence predictions using different models for describing collision dynamics, including simulation codes, too (UrQMD, AMPT, HIJING). The influences of the correlations and fluctuations on the predicted results are considered in present work. From the mutual influences of the two regions – participant and spectator – up to the presence of a few free quarks in the hot and very dense nuclear matter from the participant region these influences are taken into account for confident predictions. Previous experimental results obtained in nucleus-nucleus collisions at similar energies with different systems of accelerators (Synchrophasotron - JINR Dubna, BEVATRON, BEVALAC - LBNL, AGS – BNL) are taken into account for increasing of the confidence level.

Acknowledgement:

This work has been performed in the frame of a few grants awarded by the national founding agencies, namely: URFISCDI (IDEI-34/2011), IFA (F09/2014), respectively. Many thanks for support.