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arXiv 1602.04029nucl-exhep-ex
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动量为4.2，4.5和10 AGeV/c的p（C，Ta）和He（Li，C）碰撞中质子和$π^{-}$ -介子集体流的研究

Study of collective flows of protons and $π^{-}$ -mesons in p(C, Ta) and He(Li, C) collisions at momenta of 4.2, 4.5 and 10 AGeV/c

L. Chkhaidze, G. Chlachidze, T. Djobava, A. Galoyan, L. Kharkhelauri, R. Togoo, V. Uzhinsky

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10 pages, 6 figures, 2 tables
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摘要：

本文研究了p（C，Ta）和He（Li，C）相互作用中动量为4.2，4.5和10 AGeV/c的质子和$π^{-}$ -介子的集体流.这些数据是从JINR使用的流光室（SKM-200-GIBS）和丙烷泡室（PBC-500）系统中获得的。本文用Danielewicz和Odyniec的方法确定了颗粒的定向横向流动。定义了每个相互作用核对的横向流参数和各向异性发射强度的值。结果表明，质子和π介子的定向流随碰撞核对能量和质量数的增大而减小。在所有研究的相互作用中，$π^{-}$ -介子和质子流都表现出相反的方向，质子流都指向反应平面。超相对论量子分子动力学模型（UrQMD），扩大了统计多重碎裂模型（SMM），令人满意地描述所获得的实验结果。

英文摘要：

Collective flows of protons and $π^{-}$-mesons are studied at the momenta of 4.2, 4.5 and 10 AGeV/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. The method of Danielewicz and Odyniec has been employed in determining the 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 increase of the energy and the mass numbers of colliding nucleus pairs. The $π^{-}$-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), enlarged by the Statistical Multi-fragmentation Model (SMM), satisfactorily describes obtained experimental results.

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