# LXX International conference "NUCLEUS – 2020. Nuclear physics and elementary particle physics. Nuclear physics technologies"

Oct 11 – 17, 2020
Online
Europe/Moscow timezone

## On the Proton Spectra in Collisions of Heavy Ions $^{12}$C + $^{9}$Be at Energies of 0.3–2.0 GeV/nucleon in the Framework of the Hydrodynamic Approach

Oct 14, 2020, 2:40 PM
25m
Online

#### Online

Oral report Section 2. Experimental and theoretical studies of nuclear reactions.

### Speaker

Prof. Alexander D'yachenko (Petersburg State Transport Univesity)

### Description

$\bf{A.T. D'yachenko^{1}, I.A.Mitropolsky^{2}}$
$^{1}$Emperor Alexander I Petersburg State Transport University, St.Petersburg, Russia;
$^{2}$NRC"Kurchatov Institute", Petersburg Nuclear Physics Institute, Gatchina, Russia

In the progress of the hydrodynamic approach with a non-equilibrium equation of state [1], collisions with a beryllium target of nuclei $^{12}$C at energies of 0.3-2.0 GeV/nucleon with proton emission at an angle of 3.5 degrees, which were studied at the ITEP accelerator [2], are considered. The experimental proton spectra contain a high-energy cumulative part, as well as a soft part, to which fragmentation contributes. We could describe the cumulative part of the spectra within the framework of a non-equilibrium hydrodynamic approach, taking into account the nuclear viscosity and correction for the microcanonical distribution [3]. In this work, in accordance with experimental data, our calculations are supplemented by taking into account the contribution of protons from fragments in the region of overlapping parts of colliding nuclei and in the region of non-overlapping parts on the basis of the statistical fragmentation mechanism proposed earlier in [4, 5].

$\bf{References}$
1 A.T. D’yachenko, K.A. Gridnev, W. Greiner, J. Phys. $\bf{ 40G}$, 085101 (2013).
2.B.M. Abramov et al., Phys. Atom. Nucl. $\bf{78}$, 373 (2015).
3.A.T. D’yachenko, I.A. Mitropolsky, EPJ Web of Conferences. $\bf{204}$, 03018 (2019).
4.A.S. Goldhaber, Phys. Lett. $\bf{53B}$, 306 (1974).
5.H.Feshbach, K. Huang, Phys. Lett. $\bf{47B}$, 300 (1973).

### Primary author

Prof. Alexander D'yachenko (Petersburg State Transport Univesity)