Measurements of $$\pi ^\pm $$ π ± , $$K^\pm $$ K ± , p and $$\bar{p}$$ p ¯ spectra in $$^7$$ 7 Be+ $$^9$$ 9 Be collisions at beam momenta from 19 A to 150 A $${\mathrm{Ge} \mathrm{V}}\!/\!c$$ Ge V / c with the NA61/SHINE spectrometer at the CERN SPS
2021
The NA61/SHINE experiment at the CERN Super Proton Synchrotron (SPS) studies the onset of deconfinement in hadron matter by a scan of particle production in collisions of nuclei with various sizes at a set of energies covering the SPS energy range. This paper presents results on inclusive double-differential spectra, transverse momentum and rapidity distributions and mean multiplicities of $$\pi ^\pm $$
, $$K^\pm $$
, p and $$\bar{p}$$
produced in the 20% most central $$^7$$
Be+
$$^9$$
Be collisions at beam momenta of 19A, 30A, 40A, 75A and 150A
$${\mathrm{Ge} \mathrm{V}}\!/\!c$$
. The energy dependence of the $$K^\pm $$
/
$$\pi ^\pm $$
ratios as well as of inverse slope parameters of the $$K^\pm $$
transverse mass distributions are close to those found in inelastic p+p reactions. The new results are compared to the world data on p+p and Pb+Pb collisions as well as to predictions of the Epos, Urqmd, Ampt, Phsd and Smash models.
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