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2026-06-11 23:58

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Conference: Bucharest University Faculty of Physics 2026 Meeting

Section: Nuclear and Elementary Particles Physics

Title:

The particle to antiparticle ratios, isospin symmetry, nuclear densities and the equation of state in nucleus-nucleus collisions at FAIR-GSI energies

Authors:

Alexandru JIPA1, Nicolae George ȚUȚURAȘ1, Oana RISTEA1, Marius CĂLIN1, Tiberiu EȘANU1,2, Cătălin RISTEA1,3, Dan ARGINTARU1,4, Murat ABLAI1, Ioan Valentin GROSSU1, Simona DÎRlECI-DAVID1, Diana DEARĂ1, Livia ILIE1,

^*
Affiliation:

1 Research Centre Nuclear Matter in Extreme Conditions, Department of Structure of Matter, Earth and Atmosphere Physics, Astrophysics, Faculty of Physics, University of Bucharest, ROMANIA

2 ”Horia Hulubei” National Institute of Physics and Nuclear Engineering, Bucharest-Măgurele, ROMANIA

3 Institute of Space Sciences Bucharest-Măgurele, ROMANIA

4 Maritime University of Constanza, Constanza, ROMANIA

E-mail

jipa@brahms.fizica.unibuc.ro

Keywords:

particle to particle ratio, nuclear densities, isospin symmetry, equation of state

Abstract:

The nucleus-nucleus collisions at relativistic and ultrarelativistic energies must give some answer of very interesting and intriguing problems for clarifying the nuclear matter structure, interaction mechanisms, particle generation, conditions for diverse phase transitions in nuclear matter and possible connections with the Universe’s evolution. Some experimental results, as well as many simulation predictions, indicate some interesting new energy regions for such results. Also, the collective flow of the very dense and hot nuclear matter could hide, sometimes, interesting mechanisms and individual behaviours of different particles. In this perspective, our group tried, during the time, to combine the global analysis with collision geometry and the interplay among participant region and spectator regions, in each collision. In this work we discuss some interesting results of simulations for symmetric collisions at SIS 100 energies and experimental results obtained in older or newer experiments, at different energies, trying to consider the nuclear medium effects on the individual particles properties. The diverse tensors considered in the global analysis, such as flow tensor, thrust tensor, sphericity tensor etc., could help us in this tentative, considering their possibilities to include isospin asymmetry, influences of nuclear matter densities, as well as the assumption that, sometimes, the particle to antiparticle ratios could hide some differences.

Acknowledgement:

This work was performed in the frame of the Romania-FAIR Program, grants obtained in competitions organized since 2016 up to 2024. Many thanks for support.