Data of UrQMD Calculations of the Nucleonic Flow and Pion Production Observables

This dataset is based on simulations using the updated ultra-relativistic quantum molecular dynamics (UrQMD) model to analyze the impacts of isospin-independent momentum-dependent interactions (MDI) and near-threshold NN → NΔ cross-sections on nucleonic flow and pion production observables. By incorporating these updates, the dataset provides 17 key observables, including directed flow and elliptic flow for neutrons, protons, hydrogen, and charged particles, as well as pion multiplicity (M(π)) and its ratio (M(π−)/M(π+)). These observables are characterized as functions of transverse momentum or normalized rapidity.The datase is useful to understand the symmetry energy and its density-dependent behavior at the flow characteristic density of 1.2 ± 0.6ρ0 and the pion characteristic density of 1.5 ± 0.5ρ0. Through the analysis of the flow and pion observables, the corresponding symmetry energy constraints are obtained which are S(1.2ρ0) = 34 ± 4 MeV and S(1.5ρ0) = 36 ± 8 MeV.

本数据集基于更新后的超相对论量子分子动力学（UrQMD）模型模拟，旨在分析同位旋无关的动量依赖相互作用（MDI）及近阈NN→NΔ截面对核子流与π介子产生观测量的影响。通过纳入这些更新，数据集提供了17个关键观测量，包括中子、质子、氢核和带电粒子的定向流与椭圆流，以及π介子多重数（M(π)）及其比值（M(π⁻)/M(π⁺)）。这些观测量以横动量或归一化快度的函数形式表征。该数据集有助于理解对称能及其在流特征密度1.2±0.6ρ₀和π介子特征密度1.5±0.5ρ₀处的密度依赖行为。通过对流与π介子观测量的分析，得到了对应的对称能约束：S(1.2ρ₀)=34±4 MeV和S(1.5ρ₀)=36±8 MeV。