Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2007-07-22
Nucl.Phys.A794:115-131,2007
Physics
Nuclear Physics
Nuclear Experiment
20 pages with 8 figures, submitted to Nuclear Physics A
Scientific paper
10.1016/j.nuclphysa.2007.08.003
Collective flow of protons and negative pions has been studied within the momentum region of $4.2 \div 4.5$ AGeV/c ($E =3.4 \div 3.7$ AGeV) for different projectile-target combinations involving carbon and, specifically, He-C, C-C, C-Ne, C-Cu and C-Ta. The data stem from the SKM-200-GIBS streamer chamber and from Propane Bubble Chamber systems utilized at JINR. The directed flow of protons grows dramatically in the carbon region when the counterpart nucleus grows in mass between He and Ta. The elliptic proton flow points out of the reaction plane and also strengthens as system mass increases. Within the reaction plane, the negative pions flow in the same direction as protons for the lighter of the investigated systems, He-C, C-C and C-Ne, and in the opposite direction for the heavier, C-Cu and C-Ta. The Quark-Gluon String Model reproduces observed changes in the flow with system mass.
Chkhaidze L.
Danielewicz Pawel
Djobava Tamar
Kharkhelauri Lali
Kladnitskaya E.
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