Centrality dependence of proton and antiproton spectra in Pb+Pb collisions at 40A GeV and 158A GeV measured at the CERN Super Proton Synchrotron

Journal Article · Sat Jan 15 04:00:00 EST 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.83.014901· OSTI ID:21499353

Anticic, T; Kadija, K; Nicolic, V; Susa, T ^[1]; Baatar, B; Kolesnikov, V I; Malakhov, A I; Melkumov, G L ^[2]; Barna, D; Fodor, Z; Laszlo, A; Palla, G; Sikler, F; Vesztergombi, G ^[3]; Bartke, J; Kowalski, M; Rybicki, A ^[4]; Beck, H; Blume, C; Book, J ^[5]

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1. Rudjer Boskovic Institute, Zagreb (Croatia)
2. Joint Institute for Nuclear Research, Dubna (Russian Federation)
3. KFKI Research Institute for Particle and Nuclear Physics, Budapest (Hungary)
4. Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Cracow (Poland)
5. Fachbereich Physik der Universitaet, Frankfurt (Germany)

The yields of (anti)protons were measured by the NA49 Collaboration in centrality-selected Pb + Pb collisions at 40A and 158A GeV. Particle identification was obtained in the laboratory momentum range from 5 to 63 GeV/c by measuring the energy loss dE/dx in the time projection chamber detector gas. The corresponding rapidity coverage extends 1.6 units from midrapidity into the forward hemisphere. Transverse-mass spectra, the rapidity dependences of the average transverse mass, and rapidity density distributions were studied as a function of collision centrality. The values of the average transverse mass as well as the midrapidity yields of protons normalized to the number of wounded nucleons show only modest centrality dependences. In contrast, the shape of the rapidity distribution changes significantly with collision centrality, especially at 40A GeV. The experimental results are compared to calculations of the hadron-string dynamics and the ultrarelativistic quantum-molecular-dynamics transport models.

• OSTI ID: 21499353
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 1 Vol. 83; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
ANTIBARYONS
ANTIMATTER
ANTINUCLEI
ANTINUCLEONS
ANTIPARTICLES
ANTIPROTONS
ATOM COLLISIONS
ATOM-ATOM COLLISIONS
BARYONS
CALCULATION METHODS
CERN SPS SYNCHROTRON
COLLISIONS
CYCLIC ACCELERATORS
DENSITY
DISTRIBUTION
DRIFT CHAMBERS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY LOSSES
ENERGY RANGE
FERMIONS
GEV RANGE
HADRONS
LEAD
LOSSES
MASS
MASS SPECTRA
MATTER
MEASURING INSTRUMENTS
METALS
MOLECULAR DYNAMICS METHOD
MULTIWIRE PROPORTIONAL CHAMBERS
NUCLEI
NUCLEONS
PARTICLE IDENTIFICATION
PARTICLE PROPERTIES
PARTICLE RAPIDITY
PHYSICAL PROPERTIES
PROPORTIONAL COUNTERS
PROTONS
RADIATION DETECTORS
RELATIVISTIC RANGE
SPECTRA
SYNCHROTRONS
TIME PROJECTION CHAMBERS
TRANSPORT THEORY