从AGS/FAIR到RHIC能量的HIC中通过HBT关联的π介子冻结
Pion freeze-out through HBT correlation in HICs from AGS/FAIR to RHIC energies
摘要：
在这次演讲中，我们介绍了从AGS到RHIC能量的重离子碰撞（HIC）中冻结时的两π HBT关联的结果。采用UrQMD强子弦输运模型和CRAB分析程序。基于叶栅模型的计算结果与实验值吻合较好，但也存在一定的偏差。如：I），HBT的时间相关的难题存在于所有的能量。在低能AGS情况下，π源冻结时的体积和平均自由程都比实验值小。这意味着需要更好地描述HIC早期阶段的颗粒相互作用。
英文摘要：
In this talk we present the results of two-pion HBT correlation at freeze-out in heavy ion collisions (HICs) from AGS to RHIC energies. The UrQMD hadron-string transport model as well as the CRAB analyzing program are adopted. Based on the cascade mode, in general, the calculations are satisfying and well in line with the experimental data although discrepancies are not negligible. Such as: I), the HBT time-related puzzle exists at all energies. II), at low AGS energies, the calculated volume as well as the mean free path of pion source at freeze-out are lower than data. It implies that a better description of interactions of particles at early stage of HICs is required.
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