论文标题
重型离子碰撞中的斑点簇形成
Midrapidity cluster formation in heavy-ion collisions
论文作者
论文摘要
我们研究了使用Parton-Hadron-Quantum-Molocular-Molecular-Denmicts（PHQMD）方法的簇中簇和高核的产生，这是一种基于QMD的QMD传播，一种基于密度依赖于密度依赖的2-boty 2-boty潜在的QMD的微观N体传输模型。在PHQMD中，群集形成是由相互作用引起的动态发生的。群集通过最小跨越树（MST）算法识别。与相对论能量的可用实验数据相比，我们介绍了簇和高核形成的PHQMD结果。 PHQMD允许研究形成的簇的时间演变及其生产的起源，这有助于了解如何形成这种弱约束的物体并在重型离子碰撞中产生的相当密集和热的环境中生存。因此，它提供了“火中的冰”难题的解释。为了研究“火灾中的冰”难题的这种解释仅适用于MST结果，我们还通过合并研究了杜特龙的生产。我们将MST和合并嵌入PHQMD和口气传输方法中，以获得独立的模型结果。我们发现，这两个聚类过程均给出了URQMD和PHQMD环境中的Deuteron可观察物的结果。这证实了我们对“火灾中的冰”难题的解决方案是MST和合并的常见，并且独立于运输方法。
We study the production of clusters and hypernuclei at midrapidity employing the Parton-Hadron-Quantum-Molecular-Dynamics (PHQMD) approach, a microscopic n-body transport model based on the QMD propagation of the baryonic degrees of freedom with density dependent 2-body potential interactions. In PHQMD the cluster formation occurs dynamically, caused by the interactions. The clusters are recognized by the Minimum Spanning Tree (MST) algorithm. We present the PHQMD results for cluster and hypernuclei formation in comparison with the available experimental data at relativistic energies. PHQMD allows to study the time evolution of formed clusters and the origin of their production, which helps to understand how such weakly bound objects are formed and survive in the rather dense and hot environment created in heavy-ion collisions. It offers therefore an explanation of the 'ice in the fire' puzzle. To investigate whether this explanation of the 'ice in the fire' puzzle applies only to the MST results we study also the deuterons production by coalescence. We embed MST and coalescence in the PHQMD and UrQMD transport approaches in order to obtain model independent results. We find that both clustering procedures give very similar results for the deuteron observables in the UrQMD as well as in the PHQMD environment. This confirms that our solution for the 'ice in the fire' puzzle is common to MST and coalescence and independent of the transport approach.
