论文标题
用粗粒状传输模拟探测相对论核冲突中的化学冻结标准
Probing chemical freeze-out criteria in relativistic nuclear collisions with coarse grained transport simulations
论文作者
论文摘要
我们介绍了一种基于弹性和非弹性散射速率的新方法，以从E $ _ \ Mathrm {lab} = 1.23 $ agev到$ \ sqrt {s_ \ s_ \ syrm {nn}} = 62.4 $ geev中提取化学冻结模型的超表面。在这项研究中，采用了与粗粒方法结合使用的超相关量子分子动力学（URQMD）模型。化学冻结分布是通过涉及共振的几个腐烂和重建链从普斯重建的，并考虑了非弹性，伪弹性和弦激发反应。然后将提取的平均温度和重型化学电位与统计模型分析进行比较。最后，我们研究了文献中建议的各种冻结标准。我们在此微观动力学模拟中确认，所有能量的化学冻结与$ \ langle e \ rangle/\ langle n \ rangle \ langle \ langle \ of1 $ gev，而其他标准，例如$ s/t^3 = 7 $ and $ n_ \ n_ \ n_ \ n_ \ mathrm {b}+n_ \ barrm { FM $^{ - 3} $仅限于更高的碰撞能量。
We introduce a novel approach based on elastic and inelastic scattering rates to extract the hyper-surface of the chemical freeze-out from a hadronic transport model in the energy range from E$_\mathrm{lab}=1.23$ AGeV to $\sqrt{s_\mathrm{NN}}=62.4$ GeV. For this study, the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) model combined with a coarse-graining method is employed. The chemical freeze-out distribution is reconstructed from the pions through several decay and re-formation chains involving resonances and taking into account inelastic, pseudo-elastic and string excitation reactions. The extracted average temperature and baryon chemical potential are then compared to statistical model analysis. Finally we investigate various freeze-out criteria suggested in the literature. We confirm within this microscopic dynamical simulation, that the chemical freeze-out at all energies coincides with $\langle E\rangle/\langle N\rangle\approx1$ GeV, while other criteria, like $s/T^3=7$ and $n_\mathrm{B}+n_\mathrm{\bar{B}}\approx0.12$ fm$^{-3}$ are limited to higher collision energies.
