01.02.2021: Implementarea etapelor II este in desfasurare.

"Strangeness, nuclear matter flow and possible connections with cosmological scenarios at CBM Experiment"

„Stranietate, curgerea materiei nucleare și posibile conexiuni cu scenarii cosmologice la Experimentul CBM /STRAFLOW@CBM ”

Contract finantare nr. FAIR_08/17.11.2020


The research team involved in the project is part of the CBM Collaboration (Compressed Baryonic Matter) from 27.II.2008. The CBM experiment aims to investigate the behavior of the nuclear matter above the compression threshold, considering the physical phenomena that will occur after reaching this threshold. Reaching this threshold makes it possible to investigate cosmological processes of interest, starting from the behavior of very dense and hot nuclear matter. Taking into account the new research program and the energies available at the FAIR (Facility for Antiproton and Ion Research) accelerators, it can be considered that highly compressed nuclear matter could later evolve in different ways, according to the type of thermodynamic equilibrium established in the participating region, with the modification of some specific properties of it. A property of interest is strangeness. Because among the types of equilibrium one of the most interesting is the local thermodynamic equilibrium, changes in strangeness can be discussed in close connection with the hydrodynamic behavior of the dynamics of relativistic and ultra-relativistic nuclear collisions. Different types of fluids, with different properties, can be associated with it. The members of the research team want through this project to continue the involvement in this fascinating and interesting field, by investigating specific aspects of the dynamics of relativistic and ultra-relativistic nuclear collisions, taking into account the signals of possible phases of nuclear matter and possible transitions between these phases (SKM-200 experiment from JINR Dubna, BRAHMS experiment from RHIC-BNL etc). The scientific research activity - partially carried out in research projects, with the Institute of Atomic Physics (F09/30.VI.2014, F09/16.IX.2016) - was in line with the scientific interests of the collaboration, a fact highlighted of recent publications of the collaboration (T.Ablyazimov et al (CBM Collaboration) – Challenges in QCD matter Physics – The scientific programme of the Compressed Baryonic Matter experiment at FAIR – European Physical Journal A53(3)(2017)60-i2017-12248-y, P.Senger – Particles 3(2)(2020)320-335) Interesting results on the change in strangeness, the production of hypernuclei, the flow of nuclear matter, the possibility of introducing a nuclear "Hubble constant" for the evolution of the participating region have been published in ISI journals and CBM Collaboration annual reports or presented at prestigious international conferences in the field of relativistic and ultra-relativistic heavy ion physics. Results from experiments such as mini-CBM and HADES will be considered. Comparisons of the simulations, code and model calculations with these experimental results will be done.

Autoritatea Contractanta: Institutul de Fizica Atomica, Magurele
Contractor: Facultatea de Fizica, Universitatea din Bucuresti
Director de proiect: Prof.univ.dr. Alexandru JIPA
Durata: 36 luni
Echipa de cercetare

Etapa I an 2020
Etapa II an 2021
Etapa III an 2022
Etapa IV an 2023

Study of the strangeness production in relativistic nuclear collisions, analysis of previous experimental results and predictions for collision energies available at FAIR-GSI.

Study of chemical freeze-out stage in nuclear collisions at FAIR-GSI and NICA-JINR energies.

Study of φ meson decay at FAIR-GSI energies.

Investigation of the hyperons production and connections with cosmological scenarios. Estimates of interest parameters at FAIR energies.
A1.1- Analysis of the strange particle yields, pT and rapidity distributions, ratios produced in relativistic nuclear collisions. Simulations using AMPT (default and string-melting version) and UrQMD codes. Energy and centrality dependencies study.
A2.1 - Determination of chemical freeze-out parameters in analyzed collisions, using models for the particle yields and a statistical model (THERMUS) for thermal fit.
A2.2 - Comparison of experimental results with the simulation code prediction. Study of the system, energy, and collision centrality dependence of the chemical freeze-out parameters.

A3.1 -Leptons’ separation at CBM Experiment. Analysis of the possibility to identify di-leptons decay channels.
A3.2 -Analysis of the di-electron invariant mass spectrum in different bins of pT/mT and rapidity.
A4.1 -Estimations for hyperons production rates and analysis of the investigation of the hypernuclei production as projectile fragments.
A4.2 -Estimations of the bulk properties of the fireball and estimation of the „microscopic Hubble constant” for Au-Au collisions at FAIR energies