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arXiv 2402.12912nucl-thnucl-ex
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不可压缩性 $K_{0}$ 在中能重离子碰撞中的效应

Effects of incompressibility $K_{0}$ in heavy-ion collisions at intermediate energies

Xiao-Xiao Long, Gao-Feng Wei

AI总结:

本文研究中能重离子碰撞中不可压缩性 $K_{0}$ 的影响,发现其显著改变中心密度和末态粒子分布,但对 $n/p$ 比、中子-质子流及π介子比等观测量影响较小,这些主要受对称能斜率支配。

摘要:

在核不可压缩性 $K_{0}$ 可能的最小不确定性范围内,我们研究了 $K_{0}$ 在中能重离子碰撞中的效应。基于使用同位旋和动量依赖的输运模型对 400 MeV/核子 Au + Au 碰撞的模拟,我们发现不可压缩性 $K_{0}$ 确实显著影响中心区域可达到的密度,从而影响末态粒子产生和/或分布,例如核子快度分布和带电π介子的产额。然而,通过检查自由中子与质子比 $n/p$、中子-质子微分横向流和定向流以及带电π介子比 $π^{-}/π^{+}$ 及其动能分布,我们发现这些可观测量受 $K_{0}$ 不确定性的影响较小,而主要对饱和密度处对称能的斜率敏感。我们还将我们的结果与相应数据进行了比较和讨论。

英文摘要:

Within the possible least uncertainty on the nuclear incompressibility $K_{0}$, we examine effects of $K_{0}$ in heavy-ion collisions at intermediate energies. Based on simulations of Au + Au collision at 400 MeV/nucleon using an isospin- and momentum-dependent transport model, we find that the incompressibility $K_{0}$ indeed affects significantly the attainable density in central regions, and thus the particle productions and/or distributions at final states, e.g., nucleon rapidity distributions and yields of charged pions. Nevertheless, through examining the free neutron over proton ratios $n/p$, the neutron-proton differential transverse and directed flows as well as the charged pion ratio $π^{-}/π^{+}$ and its kinetic energy distribution, we find that these observables are less affected by the uncertainty of $K_{0}$, but mainly sensitive to the slope of symmetry energy at the saturation density. We also compare and discuss our results with the corresponding data.

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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