Study of collective matter flow in central C-Ne and C-Cu collisions at energy of 3.7 GeV per nucleon

Details Study of collective matter flow in central C-Ne and C-Cu collisions at energy of 3.7 GeV per nucleon Study of collective matter flow in central C-Ne and C-Cu collisions at energy of 3.7 GeV per nucleon

1999-12-16

arxiv.org/abs/hep-ex/9912035v1

Phys.Lett. B479 (2000) 21-28

Physics

High Energy Physics

High Energy Physics - Experiment

15 pages with 4 postscript figures. submitted to Phys.Lett.B

Scientific paper

10.1016/S0370-2693(00)00346-4

The transverse momentum technique is used to analyse charged-particle exclusive data in the central C-Ne and C-Cu interactions at energy of 3.7 Gev per nucleon. The clear evidence of in-plane and out-of-plane (squeeze-out) flow effects for protons and $\pi^{-}$ mesons have been obtained. In C-Ne interactions the $\pi^{-}$ mesons in-plane flow is in the same direction to the protons, while in C-Cu collisions pions show antiflow behaviour. From the transverse momentum and azimuthal distributions of protons and pi^{-} mesons with respect to the reaction plane the flow F (the measure of the amount of collective transverse momentum transfer in the reaction plane) and the parameter a_{2} (the measure of the strength of the anisotropic emission) have been extracted. The flow effects increase with the mass of the particle and atomic number of target A_{T}. The comparison of our in-plane flow results with flow data of various projectile/target configurations had been done by a scaled flow F_{S}=F/(A_{P}^{1/3}+A_{T}^{1/3}). F_{S} demonstrates a common scaling behaviour among flow values from different systems.

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