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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.
