Eur. Phys. J. A (2016) 52: 351
https://doi.org/10.1140/epja/i2016-16351-3

Regular Article - Experimental Physics

Study of collective flows of protons and -mesons in p+C, Ta and He+Li, C collisions at momenta of 4.2, 4.5 and 10 AGeV/c

¹ High Energy Physics Institute of Tbilisi State University, Tbilisi, Georgia
² Fermi National Accelerator Laboratory, 60510, Batavia, IL, USA
³ Veksler and Baldin Laboratory of High Energy Physics, Joint Institute for Nuclear Research, Dubna, Russia
⁴ Institute of Physics and Technology of the Mongolian Academy of Sciences, Ulan Bator, Mongolia
⁵ Laboratory of Information Technologies, Joint Institute for Nuclear Research, Dubna, Russia

^* e-mail: galoyan@lxpub01.jinr.ru

Received: 15 February 2016
Accepted: 8 November 2016
Published online: 30 November 2016

Abstract

Collective flows of protons and -mesons are studied at the momenta of 4.2, 4.5 and 10AGeV/c for p+C, Ta and He+Li, C interactions. The data were obtained from the streamer chamber (SKM-200-GIBS) and from the Propane Bubble Chamber (PBC-500) systems utilized at JINR. A method of Danielewicz and Odyniec has been employed in determining a directed transverse flow of particles. The values of the transverse flow parameter and the strength of the anisotropic emission were defined for each interacting nuclear pair. It is found that the directed flows of protons and pions decrease with increasing the energy and the mass numbers of colliding nucleus pairs. The -meson and proton flows exhibit opposite directions in all studied interactions, and the flows of protons are directed in the reaction plane. The Ultra-relativistic Quantum Molecular Dynamical Model (UrQMD) coupled with the Statistical Multi-fragmentation Model (SMM), satisfactorily describes the obtained experimental results.