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arXiv 2602.22690nucl-thhep-ph
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重离子碰撞中高重子密度和重子阻止的时空区域

Space-time regions of high baryon density and baryon stopping in heavy-ion collisions

Bogoliubov Laboratory of Theoretical Physics, JINR（鲍戈留博夫理论物理实验室，俄罗斯联合核研究所）；National Research Center ”Kurchatov Institute”（库尔恰托夫国家研究中心）

Yuri B. Ivanov

备注：
8 pages, 4 figures, version published in Phys.Rev.C
发表信息：
Phys. Rev. C 113, 064906 (2026)
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AI总结：

使用三流体动力学模型计算中心Au+Au碰撞中高重子密度物质的四体积，发现3FD模型比JAM模型有更强的重子阻止，且高密度区域随能量单调变化，最优能量范围在3.2–8 GeV。

摘要：

在三流体动力学模型（3FD）中计算了四体积（$V_4=$ 空间三维体积×寿命），并与JET AA微观输运模型（JAM）的结果进行了比较。计算针对中心Au+Au碰撞在能量$\sqrt{s_{NN}}=$ 3–19.6 GeV下进行。这些$V_4$指示了实现宏观高重子密度物质的最佳碰撞能量范围。发现3FD的四体积明显超过JAM中的四体积，这表明3FD模型中的重子阻止比JAM更强。论证了这种重子阻止的差异与这些模型中实现的状态方程（EoS）的硬度相关。与JAM相反，重子密度（$n_B$）超过正常核密度（$n_0$）三倍的四体积不随$\sqrt{s_{NN}}$呈现最大值。它随着$\sqrt{s_{NN}}$的增加单调递减，保持在相当宏观的水平（即$V_4\geq 5.5^4$ fm$^4$/c）。对于更高的重子密度，$V_4$在$\sqrt{s_{NN}}$依赖关系中呈现最大值。密度$n_B/n_0>$ 4的最佳能量范围位于$\sqrt{s_{NN}}=$ 3.2–8 GeV。即使对于$n_B/n_0>$ 6，在$\sqrt{s_{NN}}=$ 4.5–9 GeV时，四体积仍然相当宏观（$V_4\geq 4^4$ fm$^4$/c），这与JAM相反。

英文摘要：

Four-volumes ($V_4=$ spatial-3-volume$\times$lifetime) are calculated within the model of three-fluid dynamics (3FD) and compared with those of the the JET AA Microscopic Transport Model (JAM). The calculations are performed for central Au+Au collisions at energies $\sqrt{s_{NN}}=$ 3 -- 19.6 GeV. These $V_4$ indicate optimal collision-energy ranges for realizing macroscopic high baryon-density matter. It is found that the 3FD four-volumes noticeably exceed those in the JAM, which indicates a stronger baryon stopping in the 3FD model as compared to that JAM. It is argued that this difference in the baryon stopping correlates with stiffness of the EoS implemented in these models. Contrary to JAM, the four-volume, where a baryon density ($n_B$) exceeds three times the normal nuclear density ($n_0$), does not exhibit a maximum as a function of $\sqrt{s_{NN}}$. It decreases monotonically with increasing $\sqrt{s_{NN}}$, remaining at a fairly macroscopic level (i.e. $V_4\geq 5.5^4$ fm$^4$/c). For higher baryon densities, $V_4$ exhibits maxima in its dependence on $\sqrt{s_{NN}}$. The optimal energy range for densities $n_B/n_0>$ 4 is located at $\sqrt{s_{NN}}=$ 3.2 -- 8 GeV. Even for $n_B/n_0>$ 6, the four-volume remains quite macroscopic ($V_4\geq 4^4$ fm$^4$/c) at $\sqrt{s_{NN}}=$ 4.5 -- 9 GeV contrary to the JAM.

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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