CBM能区带电强子谱的中心度依赖  

Centrality Dependence of Charged Hadrons Spectrum at CBM Energies

作　　者：马键豪 吴科军[1] MA Jianhao;WU Kejun(College of Science,China Three Gorges University,Yichang 443000,China)

机构地区：[1]三峡大学理学院

出　　处：《湖北民族学院学报（自然科学版）》2019年第4期449-452,462,共5页Journal of Hubei Minzu University(Natural Science Edition)

基　　金：国家自然科学基金项目(11447023)

摘　　要：德国反质子和离子研究装置(FAIR)上的压缩重子物质(CBM)实验为研究高重子密度环境下的强相互作用物质性质提供了机遇与挑战.为了提供实验参考与理论对比,利用多相输运模型(AMPT)模拟了CBM能区(束流能量10~40 AGeV)氙氙(XeXe)碰撞,并系统研究了几种末态带电强子(π、K、p)在中心快度区的横动量谱.结果显示:在固定束流能量下,从中心碰撞到边缘碰撞,中心快度区的带电粒子产额逐渐减少.基于热化-径向流模型对强子横动量谱的拟合结果显示,在固定束流能量下,从中心碰撞到边缘碰撞,强相互作用物质系统热力学冻结时平均横向速度逐渐减小,系统温度逐渐升高.The CBM experiment at FAIR(Facility for Antiproton and Ion Research)in German provides opportunities and challenges for studying the properties of strongly interacting dense matter.In order to provide a reference for experiment and theory,we performed a systematic analysis,using a multiphase transport(AMPT)model for charged hadrons(pions,kaons and protons)spectrum in middle rapidity and a thermal model with radial flow for the fit,for Xe+Xe collisions in CBM energy area with beam energy from 10 to 40AGeV.It is found that at a fixed beam energy the yield of charged particles decreases gradually from central to peripheral collisions.The fitting results based on thermal model with radial flow for changed hadrons spectrum show that at the fixed beam energy the average transverse velocity at thermodynamic freezing of the strongly interacting mater gradually decreases from central to peripheral collisions,but the kinetic freeze-out temperature gradually increases.

关 键 词：压缩重子物质 强子谱 多相输运模型 热力学冻结温度 中心度 

分 类 号：O572.21[理学—粒子物理与原子核物理]