用HIC探测亚饱和密度下对称能的密度依赖性
Probing the density dependence of symmetry energy at subsaturation density with HICs
摘要：
在改进的量子分子动力学模型框架下，研究了$^{112,124}Sn+^{112,124}Sn$在$E/A=50MeV$上的中心碰撞和外围碰撞的反应机理.结果表明，多重碎裂过程是该能区的重要机制，团簇发射对双n/p比和同位旋输运比有重要影响.此外，用改进的量子分子动力学模型计算了E/A= 50 MeV时$^{112,124}Sn+^{112,124}Sn$的双n/p比、同位旋扩散和$R_{7}$比的快度分布.结果表明，这三个观测量对对称能的密度依赖性很敏感。通过计算结果与实验数据的比较，得到了这三个观测量对对称能密度依赖性的一致约束。
英文摘要：
The reaction mechanism of the central collisions and peripheral collisions for $^{112,124}Sn+^{112,124}Sn$ at $E/A=50MeV$ is investigated within the framework of the Improved Quantum Molecular Dynamics model. The results show that multifragmentation process is an important mechanism at this energy region, and the influence of the cluster emission on the double n/p ratios and the isospin transport ratio are important. Furthermore, three observables, double n/p ratios, isospin diffusion and the rapidity distribution of the ratio $R_{7}$ for $^{112,124}Sn+^{112,124}Sn$ at E/A=50MeV are analyzed with the Improved Quantum Molecular Dynamics model. The results show that these three observables are sensitive to the density dependence of the symmetry energy. By comparing the calculation results to the data, the consistent constraint on the density dependence of the symmetry energy from these three observables is obtained.
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