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Measurements of $$\pi^-$$ production in $^7$Be+$^9$Be collisions at beam momenta from 19$$A$$ to 150$$A$$GeV/$$c$$ in the NA61/SHINE experiment at the CERN SPS

Journal Article · · European Physical Journal. C, Particles and Fields
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The NA61/SHINE collaboration studies at the CERN Super Proton Synchrotron (SPS) the onset of deconfinement in hadronic matter by the measurement 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 and mean multiplicities of $$\pi^{-}$$ mesons produced in the 5% most central $^7$Be + $^9$Be collisions at beam momenta of 19$$A$$, 30$$A$$, 40$$A$$, 75$$A$$ and 150$$A$$ GeV/$$c$$ obtained by the so-called $h^-$ method which does not require any particle identification. The shape of the transverse mass spectra differs from the shapes measured in central Pb + Pb collisions and inelastic p + p interactions. The normalized width of the rapidity distribution decreases with increasing collision energy and is in between the results for inelastic nucleon-nucleon and central Pb + Pb collisions. The mean multiplicity of pions per wounded nucleon in central $^7$Be + $^9$Be collisions is close to that in central Pb + Pb collisions up to 75$$A$$GeV/$$c$$. However, at the top SPS energy the result is close to the one for inelastic nucleon-nucleon interactions. The results are discussed in the context of predictions for the onset of deconfinement at the CERN SPS collision energies.
Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Organization:
NA61/SHINE Collaboration
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1659445
Alternate ID(s):
OSTI ID: 22985017
Report Number(s):
FERMILAB-PUB--20-470-SCD; arXiv:2008.06277; oai:inspirehep.net:1811793
Journal Information:
European Physical Journal. C, Particles and Fields, Journal Name: European Physical Journal. C, Particles and Fields Journal Issue: 10 Vol. 80; ISSN 1434-6044
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (25)

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