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中文摘要：
利用同位旋和动量相关的输运模型IBUU，以Sn，Sn同位素在低能与高能碰撞为例，在两种不同的对称势作用下，研究了重离子碰撞中的对称势翻转现象．我们发现从低能到高能在同位旋相分化、发射核子的中-质比、发射核子的双n／p比，中-质微分横向流观测量中均存在对称势翻转现象，对称势翻转效应的研究有利于确定对称能的密度依赖性．
英文摘要：
Within the IBUU transport model, flipping of the symmetry potential in heavy-ion collisions is studied. It is found that there exist flipping of the symmetry potential in the isospin fractionation, the single neutron to proton ratio, the double neutron to proton ratio and the neutron-proton differential flow from lower to higher incident energies. The flipping of the symmetry potential results from the change of the relative magnitude of the hard and soft symmetry energies at lower and higher densities. Future observations of the flipped symmetry potential in experiment will help the study of the density-dependent symmetry energy.
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