在MPD/NICA装置上测定核-核碰撞中心性
Determination of centrality in nucleus-nucleus collisions on the MPD/NICA installation
摘要：
测量核-核碰撞中的旁观者数量可以用来确定参与相互作用的核子的数量，即获得关于碰撞中心性的信息。然而，在NICA对撞机的能量，能量分辨率的前向强子量能器是不够的分离振幅对应于不同数量的观众。观众数量的不确定性导致在确定中心性时产生很大的误差。在束流能量为2.5AGeV时，中心事件碰撞参数的计算误差约为40%，外围事件碰撞参数的计算误差不超过30%。多重闪烁体探测器将允许获得更准确的数据。提出了一种确定中心度的方法，同时考虑到真实的MPD安装几何形状。
英文摘要：
Measurement of the number of spectators in nucleus-nucleus collisions could be used to determine the number of participant nucleons involved in the interaction, i.e. get information about collision centrality. However, at energies of the NICA collider, energy resolution of the forward hadron calorimeter is insufficient for separation amplitude corresponding to different number of spectators. Uncertainty in the number of spectators leads to a large error in determining centrality. For central events inaccuracy in determining the collision parameter is about 40%, for peripheral ones, no better than 30% at a beam energy of 2.5 AGeV. The multiplicity scintillator detector will allow to obtain more accurate data. A method is proposed for determining the centrality, taking into account the real MPD installation geometry.
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