Elliptic flow and system size dependence of transition energies at intermediate energies
Elliptic flow and system size dependence of transition energies at intermediate energies
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DOI：
10.1103/physrevc.74.014602
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发表时间：
2006-06
影响因子：
3.1
通讯作者：
Y. Zhang;Zhu-xia Li
中科院分区：
文献类型：
--
作者：
Y. Zhang;Zhu-xia Li
本文用输运模型研究了能量从几十到几百MeV/核子的重离子碰撞中Z ≤ 2粒子的椭圆流，改进的量子分子动力学模型（ImQMD 05）的新版本。该模型采用完整的Skyrme势能密度泛函。研究了核子-核子截面的不同有效相互作用和介质修正对椭圆流的影响。我们的结果表明，一个软核状态方程和入射能量依赖于在介质中的核子-核子截面需要描述的激发函数的椭圆流在中等能量。本文还研究了中能椭圆流跃迁能的大小依赖性。系统尺寸的跃迁能的依赖性符合系统尺寸的幂，指数为0.223。
The elliptic flow for Z <= 2 particles in heavy ion collisions at energies from several tens to several hundreds MeV per nucleon is investigated by means of a transport model, i.e., a new version of the improved quantum molecular dynamics model (ImQMD05). This model employs a complete Skyrme potential energy density functional. The influence of different effective interactions and medium corrections of nucleon-nucleon cross sections on the elliptic flow are studied. Our results show that a soft nuclear equation of state and incident energy dependent in-medium nucleon-nucleon cross sections are required to describe the excitation function of the elliptic flow at intermediate energies. The size dependence of transition energies for the elliptic flow at intermediate energies is also studied. The system size dependence of transition energies fits a power of system size with an exponent of 0.223.