中能椭圆流快度分布的探测
Rapidity distribution as a probe for elliptical flow at intermediate energies
摘要：
在基于轻子快度分布的量子分子动力学（IQMD）模型下，研究了重离子碰撞中旁观物质和参与物质之间的相互作用.在椭圆流中研究了不同快度分布形式和尺寸的影响。椭圆流态显示了附近旁观物质对参与区的重要作用。这一作用进一步解释的基础上通过时间的观众和扩展时间的参与者区。只有当快度箱中包含中间快度区域时，才能观察到从面内到面外的过渡，否则不会发生过渡。跃迁能对快度仓的大小非常敏感，而对快度分布的类型敏感性很弱。理论结果与实验结果进行了比较，发现两者吻合较好。
英文摘要：
Interplay between the spectator and participant matter in heavy-ion collisions is investigated within isospin dependent quantum molecular dynamics (IQMD) model in term of rapidity distribution of light charged particles. The effect of different types and size rapidity distributions is studied in elliptical flow. The elliptical flow patterns show important role of the nearby spectator matter on the participant zone. This role is further explained on the basis of passing time of the spectator and expansion time of the participant zone. The transition from the in-plane to out-of-plane is observed only when the mid-rapidity region is included in the rapidity bin, otherwise no transition occurs. The transition energy is found to be highly sensitive towards the size of the rapidity bin, while weakly on the type of the rapidity distribution. The theoretical results are also compared with the experimental findings and are found in good agreement.
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