【摘要】 最近的研究工作表明原子核阻止强烈地依赖于两核子碰撞截面而较弱的依赖同位旋相关的平均场 (对称势 ) .故原子核阻止可以作为提取介质中同位旋相关核子 -核子碰撞截面的探针 .详细的计算表明动量相关作用在提高原子核阻止对两体碰撞的敏感性和减弱对称对称势的敏感性中起了重要作用 .更多还原

【Abstract】 The role of momentum dependence equation of state on the nuclear stoppings coming from the isospin dependence of nucleon-nucleon cross section (two-body dissipation ) and the isospin dependence of the mean field (one-body dissipation) are studied by using the isospin dependence quantum molecular dynamics. A detail studies indicate that the difference between the nuclear stoppings coming from the isospin dependence and the isospin independence of in-medium nucleon-nucleon cross sections in the presence of momentum dependence interaction is larger than that without the momentum dependence interaction. The difference between the nuclear stoppings coming from the isospin dependence of the mean field (symmetry potential) and the isospin independence of the mean field in the presence of momentum dependence interaction is also larger than that without momentum dependence interaction. But the importance point is that the enhancement of the difference between nuclear stoppings from the isospin dependence of two-body dissipation is larger than that from the isospin dependence of one-body dissipation in the presence of momentum dependence interaction. Namely in comparison with each other, the momentum dependence equation of state enhances the sensitivity of nuclear stopping on the isospin dependence of in-medium nucleon-nucleon cross section and reduces the sensitivity of the nuclear stopping on the symmetry potential, leading to that the nuclear stopping depends sensitively on the isospin dependence of nucleon-nucleon cross section and weakly on the symmetry potential. So the nuclear stopping can be a probe for extracting in-medium isospin depends nucleon-nucleon cross section in heavy collisions if MDI is taken into account.更多还原