质子椭圆流与对称能的密度依赖性

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

基于同位旋和动量依赖的强子输运IBUU04模型,研究了^(132)Sn+^(124)Sn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.

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/AMeV 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.