质子椭圆流与对称能的密度依赖性

基于同位旋和动量依赖的强子输运IBUU04模型, 研究了¹³²Sn+¹²⁴Sn碰撞系统中的质子椭圆流对对称能的敏感关系. 研究发现入射能量从每核子400MeV到800MeV时质子椭圆流在低横动量端对对称能的敏感性高于高横动量端, 同时发现随着入射能量的增大, 质子椭圆流对对称能的敏感性在降低. 在研究入射能量范围内, 当入射能量为每核子400MeV左右时质子椭圆流对对称能最为敏感.

Probinhg the High Density Behavior of the Symmetry Energy by Using Proton Elliptic Flow

Based on the isospin- and momentum-dependent transport model IBUU04,we calculated the reaction of the ~(132)Sn ~(124)Sn systems in semi-central collisions at beam energies of 400/A MeV,600/A MeV and 800/A MeV by adopting two different density dependent symmetry energies.It was found that the proton differential elliptic flow as a function of transverse momentum is quite sensitive to the density dependence of symmetry energy,especially for the considered beam energy range.Therefore the proton differential elliptic flow may be considered as a robust probe for investigating the high density behavior of symmetry energy in intermediate energy heavy ion collisions.