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

Oct 11 – 17, 2020
Online
Europe/Moscow timezone

## The Study of Charged Hadrons and Nuclear Fragments Forward Production in $CC$ Collisions at Beam Energy 20.5 GeV/nucleon

Oct 16, 2020, 5:50 PM
20m
Online

#### Online

Oral report Section 4. Relativistic nuclear physics, elementary particle physics and high-energy physics.

### Speaker

Mikhail Bogolyubsky (NRC Kurchatov Institute - IHEP)

### Description

Inclusive differential cross sections for the forward production of charged hadrons and nuclei are measured in $CC$-interactions depending on their momentum at beam energy 20.5 GeV/nucleon ($\sqrt{S_{NN}}=$6.3 GeV). The measurements have been performed at the U-70 Accelerator Complex (Protvino) using a combined spectrometer on base of beamline 22. Particle selection was carried out by measuring of ionization in scintillation counters taking into account the data from threshold Cherenkov counters and hadron calorimeter and mass was determined through Cherenkov light emission angle measured in the spectrometer of ring imaging Cherenkov radiation. For hadrons the available data are for momenta from 8 to 51 GeV/c. For fragments the data are given for charge 1$\le$$Z$$\le$6, atomic number 1$\le$$A$$\le$10 and $A$$/$$Z$$<$3.4 with momenta in range 20 -- 210 GeV/$c$. The measurements are compared with Fritiof model, statistical models and theoretical parameterizations on the base of scaling invariance for nuclear processes. The hadrons data show essential yield of particles in the kinematical forbidden region in free $NN$ collisions. The maxima of distributions for fragments are shifted towards large momenta proportionally to the fragment atomic number $A$ and they also substantially produced in the kinematical forbidden region above this peak. The comparison of these data with analogous results at lower energy 1.05 GeV/nucleon shows that the general dependence of cross sections on the variable $x$=$P_{lab}/p_0$ is similar, but they are noticeably lower at larger energy 20.5 GeV/nucleon. The mentioned difference varied from a factor of 5 times near the fragmentation peak to several orders of magnitude beyond this peak.

This work was supported by the grant from the Russian Foundation for Basic Research No 19-02-00278.

### Primary author

Mikhail Bogolyubsky (NRC Kurchatov Institute - IHEP)

### Co-authors

Alexei Volkov (Institute for High Energy Physics of NRC Kurchatov Institute (R) Dmitry Elumakhov (Institute for High Energy Physics of NRC Kurchatov Institute (R) Alexander Afonin (Institute for High Energy Physics (RU)) Alexandre Ivanilov (State Res.Center of Russian Feder. Inst.f.High Energy Phys. (IFVE)) Alexey Kalinin (Institute for High Energy Physics of NRC Kurchatov Institute (R) Alexander Krinitsyn (State Res.Center of Russian Feder. Inst.f.High Energy Phys. (IFVE)) Nikita Kulagin (Institute for High Energy Physics of NRC Kurchatov Institute (R) Dmitri Ivanovich Patalakha (Institute for High Energy Physics (IHEP)) Victor Skvortsov (Institute for High Energy Physics of NRC Kurchatov Institute (R) Vladimir Talov (Institute for High Energy Physics of NRC Kurchatov Institute (R) Leonid Turchanovich (Institute for High Energy Physics (RU)) Yury Chesnokov (Institute for High Energy Physics of NRC Kurchatov Institute (R) Kirill Romanishin (Institute for High Energy Physics of NRC Kurchatov Institute (R) Dr Vladimir Zapolsky (NRC Kurchatov Institute - IHEP)