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arXiv 1102.4696nucl-th
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从重离子碰撞中的奇异产生约束核物质状态方程的高密度行为

Constraining the high-density behavior of nuclear equation of state from strangeness production in heavy-ion collisions

Zhao-Qing Feng

摘要:

用兰州量子分子动力学模型研究了1AGeV重离子碰撞中π介子和奇异粒子的动力学行为,探讨了超饱和密度下的核物质状态方程.选取Skyrme参数SkP、SLy 6、Ska和SIII,计算了$^{197}$ Au+ $^{197}$ Au和$^{12}$ C+ $^{12}$ C体系中对应于对称核物质不同不可压缩模量和不同对称能刚度情况的总多重数和多重数比.观察到奇异粒子产生比的激发函数随入射能量的增加而减小的趋势。用参数SkP较好地描述了KaoS合作测量的K $^{+}$生成数据,得到了一个软状态方程。这些结论不能被介质中的K介子-核子势所修正。

英文摘要:

The dynamics of pions and strange particles in heavy-ion collisions in the region of 1A GeV energies is investigated by the lanzhou quantum molecular dynamics model for probing the nuclear equation of state at supra-saturation densities. The total multiplicities and the ratios obtained in $^{197}$Au+$^{197}$Au over $^{12}$C+$^{12}$C systems are calculated for selected Skyrme parameters SkP, SLy6, Ska and SIII, which correspond to different modulus of incompressibility of symmetric nuclear matter and different cases of the stiffness of symmetry energy. A decrease trend of the excitation functions of the ratios for strange particle production with increasing incident energy was observed. The available data of K$^{+}$ production measured by KaoS collaboration are described well with the parameter SkP, which results in a soft equation of state. The conclusions can not be modified by an in-medium kaon-nucleon potential.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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