论文标题
$ \ sqrt {s_ {nn}} = 2.4 $ gev
Proton, deuteron and triton flow measurements in Au+Au collisions at $\sqrt{s_{NN}} = 2.4$ GeV
论文作者
论文摘要
流量系数的高精度测量$ v_ {n} $（$ n = 1-4 $）针对质子，迪特族和triton相对于一阶观众平面在$ \ sqrt {s_ {nn}}} = 2.4 $ GEV的AU+AU碰撞中进行了高精度测量。 SIS18/GSI。研究流量系数是横向动量$ p_ {t} $的函数，而快速性$ y_ {cm} $在大型相位空间和几类碰撞中心度上。对于$ v_ {1} $，$ d v_ {1}/d y^{\ prime} | _ {y^{\ prime} = 0} $，$ y^{\ prime} $是$ V_ {2} $处于中等范围的$ v_ {2} $。对于$ p_ {t} $依赖性$ v_ {2} $和$ v_ {4} $的核对依赖性的核子数量的比例，这对于核聚结表示是负核形成的主要过程。 $ v_ {2} $可以通过初始偏心$ \langleε_{2} \ rangle $进行扩展，而$ v_ {4} $用$ \langleε_{2} \ rangle^{2} \ rangle^{2} $ {2} $和$ \ langle^langle的ε__________________{4} \ rangle $。 $ v_ {1} $，$ v_ {2} $，$ v_ {3} $和$ v_ {4} $上的多分量高精度数据，$ v_ {2} $，提供了压缩baryonic物质的固有方程的重要约束。
High precision measurements of flow coefficients $v_{n}$ ($n = 1 - 4$) for protons, deuterons and tritons relative to the first-order spectator plane have been performed in Au+Au collisions at $\sqrt{s_{NN}} = 2.4$ GeV with the High-Acceptance Di-Electron Spectrometer (HADES) at the SIS18/GSI. Flow coefficients are studied as a function of transverse momentum $p_{t}$ and rapidity $y_{cm}$ over a large region of phase space and for several classes of collision centrality. A clear mass hierarchy is found for the slope of $v_{1}$, $d v_{1}/d y^{\prime}|_{y^{\prime} = 0}$ where $y^{\prime}$ is the scaled rapidity, and for $v_{2}$ at mid-rapidity. Scaling with the number of nucleons is observed for the $p_{t}$ dependence of $v_{2}$ and $v_{4}$ at mid-rapidity, which is indicative for nuclear coalescence as the main process responsible for light nuclei formation. $v_{2}$ is found to scale with the initial eccentricity $\langle ε_{2} \rangle$, while $v_{4}$ scales with $\langle ε_{2} \rangle^{2}$ and $\langle ε_{4} \rangle$. The multi-differential high-precision data on $v_{1}$, $v_{2}$, $v_{3}$, and $v_{4}$ provides important constraints on the equation-of-state of compressed baryonic matter.
