论文标题
sis能量的集体流动在望元转运方法中：光核形成的影响和状态方程
Collective flow at SIS energies within a hadronic transport approach: Influence of light nuclei formation and equation of state
论文作者
论文摘要
已知集体流量可观察物是一种敏感的工具，可以从重合离子碰撞观察中获得对核物质状态方程的见解。面对更定量的约束，必须仔细评估对集体行为的其他影响。在这项工作中，使用HADRONIC TRANSSICT方法Smash（模拟许多加速强烈相互交互的Hadron）用于研究Au+Au碰撞中的前四个各向异性流量系数在$ e _ {\ rm Lab} = 1.23a $ gev的最新数据中，在最近衡量的数据的上下文中。特别是，在这种能量状态下，光核的形成很重要。两种不同的方法相互对比：一种受合并启发的聚类算法以及通过显式横截面的杜特龙形成的显微镜形成。探索了定向和椭圆流对Skyrme平均场强度的敏感性。此外，还证明，在该能源状态下，速度-ODD $ v_3 $系数实际上为零，并且$ v_4/v_2^2 $的比率接近水力动力行为预期的0.5的值。这项研究确立了当前对SMASH方法中集体行为的理解，并为未来在改进的平均野外计算中对核问题状态方程式进行更定量的约束奠定了基础。
Collective flow observables are known to be a sensitive tool to gain insights on the equation of state of nuclear matter from heavy-ion collision observations. Towards more quantitative constraints one has to carefully assess other influences on the collective behaviour. In this work a hadronic transport approach SMASH (Simulating Many Accelerated Strongly-interacting Hadrons) is applied to study the first four anisotropic flow coefficients in Au+Au collisions at $E_{\rm lab}=1.23A$ GeV in the context of the recently measured data by the HADES collaboration. In particular, the formation of light nuclei is important in this energy regime. Two different approaches are contrasted to each other: A clustering algorithm inspired by coalescence as well as microscopic formation of deuterons via explicit cross-sections. The sensitivity of directed and elliptic flow observables to the strength of the Skyrme mean field is explored. In addition, it is demonstrated that the rapidity-odd $v_3$ coefficient is practically zero in this energy regime and the ratio of $v_4/v_2^2$ is close to the value of 0.5 expected from hydrodynamic behaviour. This study establishes the current understanding of collective behaviour within the SMASH approach and lays the ground for future more quantitative constraints on the equation of state of nuclear matter within improved mean field calculations.
