论文标题
核碰撞中质子数量波动的相变扩增来自运输模型方法
Phase transition amplification of proton number fluctuations in nuclear collisions from a transport model approach
论文作者
论文摘要
通过URQMD-3.5传输模型研究了核碰撞中粒子数波动的时间演变（$ e _ {\ rm lab} = 1.23-10a $ GEV）的时间演变。传输描述通过密度依赖性电势结合了Baryonic相互作用。这允许实施一阶相变，包括大型重子密度的机械不稳定区域。巴里昂和质子数分布的缩放差异是在不同时间的碰撞的中央立方空间体积中计算的。观察到与不稳定区域相关的波动的显着增强。这种增强持续到后期，反映了波动的记忆效应。相变的存在对动量空间中质子的可观察到的事件波动的影响要小得多。
The time evolution of particle number fluctuations in nuclear collisions at intermediate energies ($E_{\rm lab} = 1.23-10A$ GeV) is studied by means of the UrQMD-3.5 transport model. The transport description incorporates baryonic interactions through a density-dependent potential. This allows for an implementation of a first order phase transition including a mechanically unstable region at large baryon density. The scaled variance of the baryon and proton number distributions is calculated in the central cubic spatial volume of the collisions at different times. A significant enhancement of fluctuations associated with the unstable region is observed. This enhancement persists to late times reflecting a memory effect for the fluctuations. The presence of the phase transition has a much smaller influence on the observable event-by-event fluctuations of protons in momentum space.
