利用UrQMD-3.3p1模型模拟了在质心能量√SNN=7.7,11.5,19.6,27,39和62.4 GeV的Au+Au碰撞,在中心快度区域分析了质子,π+,K+以及它们相应的反粒子的椭圆流.分析了粒子与相应的反粒子的v2差值随横动量ρT的变化.分析结果表明,在UrQMD模型中在整个BES能区K-的v2值大于K+的.在能区7.7～62.4GeV 7π+和π-的v2(pT)值几乎相同.然而实验上在低能区7.7,11.5和19.6 GeV,在所考察的ρT值范围内v2(π-)大于v2(π+).能清楚看到在UrQMD模型中在整个BES能区反质子的v2大于质子的,这与实验结果相反.理论结果与实验数据相反,表明我们还需要不断深化对重离子碰撞的强耦合性和输运过程的非平衡性的理解.
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