Abstract—

A hydrodynamic approach with a nonequilibrium equation of state is used to describe collisions between heavy ions with medium energies. The double differential cross sections for the production of subthreshold \({{\pi }^{0}}\) mesons and \({{\pi }^{ + }}\)mesons during collisions between various nuclei are calculated to develop this approach with the inclusion of nuclear viscosity effects. They are in good agreement with the available experimental data.

中文翻译：

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使用非平衡状态方程的流体力学方法在重离子碰撞中产生亚阈值离子

摘要-

具有非平衡状态方程的流体动力学方法用于描述重离子与中能之间的碰撞。计算了在各个核之间碰撞时产生亚阈值\（{{\ pi} ^ {0}} \）介子和\（{{\ pi} ^ {+}} \）介子的双微分截面这种方法具有核粘性效应。它们与可用的实验数据高度吻合。