Features of the distribution of events by the multiple of secondary particles depending on the energy of collision and the assymetricity of collising relativistic nuclei

IF 0.2 Q4 PHYSICS, MULTIDISCIPLINARY Recent Contributions to Physics Pub Date : 2021-09-01 DOI:10.26577/rcph.2021.v78.i3.09
A. Fedosimova, I. A. Lebedev, E. Dmitriyeva, S. Ibraimova, E. A. Bondar, P. Krassovitskiy
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Abstract

To search for signals of the phase transition of matter from the hadronic state to the quark­gluon plasma, interactions with extreme characteristics are studied. The study of the dependence of the av­erage multiplicity on the projectile energy for sulfur and silicon nuclei with energies of 3.7 AGeV, 14 AGeV, and 200 AGeV has been carried out. Experimental data on inelastic interactions with the nuclei of the NIKFI BR­2 emulsion obtained at the SPS at CERN and at the Synchrophasotron at JINR. To take into account fluctuations in the initial conditions of the nucleus­nucleus interaction, the events were divided into central and peripheral ones. A comparative analysis of the average multiplicity with heavy and light nuclei of the photographic emulsion is presented. The multiplicity increase factor has an almost linear increase in energy (on the logarithmic axis) for all events, except for the central interactions of sulfur nuclei with heavy emulsion nuclei at 200 AGeV. These events are explosive events, which give a flux of secondary particles in a narrow range of average pseudo­rapidity and significantly shifted towards low values . The analysis of events of complete destruction of the projectile nucleus is presented. Such events are considered as events in which the most favorable conditions are created for the formation of a quark­gluon plasma.
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根据碰撞能量和相对论性核碰撞的不对称性,二次粒子的多重事件分布的特征
为了寻找物质从强子态到夸克-胶子等离子体相变的信号,研究了具有极端特征的相互作用。研究了能量分别为3.7 AGeV、14 AGeV和200 AGeV的硫核和硅核的平均复数与弹丸能量的关系。在CERN的SPS和JINR的同步加速器上获得的NIKFI BR-2乳剂与原子核的非弹性相互作用的实验数据。考虑到核-核相互作用初始条件的波动,将事件分为中心事件和外围事件。对照相乳剂的重核和轻核的平均复数进行了比较分析。除硫核与重乳化核在200 AGeV时的中心相互作用外,所有事件的多重增加因子的能量(在对数轴上)几乎呈线性增加。这些事件是爆炸性事件,次级粒子的通量在较窄的平均伪快度范围内,并显著地向低值偏移。给出了弹核完全破坏事件的分析。这样的事件被认为是为夸克-胶子等离子体的形成创造了最有利条件的事件。
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