论文标题
$^{208} $ pb的核共振荧光在重离子山脉中
Nuclear resonance fluorescence of $^{208}$Pb in heavy-ion colliders
论文作者
论文摘要
在核的超遗嘱碰撞（UPC）中，碰撞伴侣的洛伦兹收缩电磁场的影响导致了它们的激发。如果有沉重的核，中子的发射是一个主要的去毒通道，并且在相对论重型离子对撞机（RHIC）和大型强子对撞机（LHC）中检测到UPC中发出的正向中子，则通过零度量热计。但是，在中子分离能以下的UPC中，低洼离散核态的激发也可能存在。在这项工作中，通过Weizsacker-Williams方法，由208 Pb中的真实光子诱导的核共振荧光（NRF）的数据用于模拟碰撞核中离散水平的激发。由于Lorentz的提升，人们可以期望具有高达40 GEV和300 GEV的脱氧光子在LHC和未来的圆形撞机（FCC-HH）上分别朝向前向方向发射。在实验室系统中计算了此类光子的能量，速度和角度分布，可用于监视对撞机的发光度或触发UPC中的颗粒产生。
In ultraperipheral collisions (UPC) of nuclei the impact of Lorentz-contracted electromagnetic fields of collision partners leads to their excitations. In case of heavy nuclei the emission of neutrons is a main deexcitation channel and forward neutrons emitted in UPC were detected at the Relativistic Heavy-Ion Collider (RHIC) and at the Large Hadron Collider (LHC) by means of Zero Degree Calorimeters. However, the excitation of low-lying discrete nuclear states is also possible in UPC below the neutron separation energy. In this work by means of the Weizsacker-Williams method the data on nuclear resonance fluorescence (NRF) induced by real photons in 208 Pb are used to model the excitations of discrete levels in colliding nuclei. Due to Lorentz boosts one can expect that deexcitation photons with energies up to 40 GeV and 300 GeV are emitted in very forward direction, respectively, at the LHC and at the Future Circular Collider (FCC-hh). Energy, rapidity and angular distributions of such photons are calculated in the laboratory system, which can be used for monitoring of collider luminosity or triggering particle production in UPC.
