Speaker
Описание
A.T. D’yachenko$^{1,2}$
$^1$B.P. Konstantinov Petersburg Nuclear Physics Institute, National Research Center "Kurchatov Institute", Gatchina, Russia
$^2$Emperor Alexander I Petersburg State Transport University, St. Petersburg, Russia
The development of the nonequilibrium quantum hydrodynamic approach for describing the emission of cumulative protons, pions, and fragments (p, π, d, t) in heavy-ion collisions at energies of the U-70 accelerator (IHEP, Protvino), ITEP (Moscow), and the BM@N collaboration (JINR, Dubna) is considered [1-3]. The relationship between the effective Klein–Fock–Gordon equation and the equations of relativistic anisotropic quantum hydrodynamics is established. The advantage of this approach in describing the experimental data of IHEP and ITEP for the emission of protons, pions, kaons, and fragments of H, $^2$H, $^3$H, $^3$He, $^4$He, $^6$Li, $^7$Li in comparison with other theoretical models is shown.
By analyzing the experimental data from ITEP in the FRAGM experiment [4], an explanation was obtained for the splitting effect in the momentum spectra of protons and light fragments in the reaction (230 MeV/A)$^{56}$Fe+ $^9$Be→f+X. The spectrum splitting disappears with increasing ion collision energy and when going to heavier fragments. In this description, the selection of the resulting hot spot is significant and an advantage was found compared to standard cascade calculations in describing the available experimental data.
In the BM@N collaboration experiment [5], differential distributions of the transverse momentum and rapidity of $\Lambda$-hyperons were recently found in collisions of carbon nuclei on a fixed target with various nuclei at energies of 4.0 and 4.5 GeV per nucleon, which we can successfully describe in our approach, along with pions and kaons for collisions of $^{40}$Ar ions with various nuclei at an energy of 3.2 GeV per nucleon from [6].
- D’yachenko A.T., Phys. At. Nucl. $\bf{87}$, 646 (2024).
- D’yachenko A.T., Mitropolsky I.A., Phys. At. Nucl. $\bf{85}$, 1053 (2022).
- D’yachenko A.T., Phys. At. Nucl. $\bf{87}$, 125 ( 2024).
- Abramov B.M. et al. EPJ Web of Conferences $\bf{204}$, 03008 (2019)
- Afanasiev S. et al. BM@N Collaboration, arXiv:2604.13299v1 [hep-ex] 14 Apr 2026
- Afanasiev S. et al. BM@N Collaboration, JHEP $\bf{07}$, 174 (2023)4 [hep-ex/2303.16243].
