Nuclear stopping in heavy ion collisions (HIC) has been studied by means of rapidity distribution and asymmetry of nucleon momentum distribution. It is an important quantity in determining the outcome of a reaction. Fen Fu {\it et al.,} \cite{2} calculate both the radial flow and the degree of nuclear stopping in Pb + Pb and Ni + Ni at 0.4, 0.8 and 1.2 GeV/neucleon. They found that the expansion velocity as well as the degree of nuclear stopping are higher in the heavier system at all energies.

翻译：通过快速分布和核动力分布不对称的方式对重离子碰撞中的核停止进行了研究,这是确定反应结果的重要数量。 Fen Fu {it 等人,}\cite{2}计算出Pb + Pb 和 Ni + Ni 的辐射流量和核停止程度为0.4、0.8和1.2 GeV / neucleon,它们发现在较重的系统中,所有能量的扩张速度和核停止程度都更高。