论文标题
液体氩气闪光发射的特性
Properties of Liquid Argon Scintillation Light Emission
论文作者
论文摘要
液体氩在各种中微子和暗物质实验中被用作活性培养基，这要归功于其出色的电荷产量和运输特性以及闪烁体。液Argon闪烁光子以10〜nm为中心的狭窄带发射，其特征性的时间轮廓由两个组件制成，源自两个成分的衰减，该衰减的衰减为偏见者AR $ _2^*$的三重态和三重态，以解离的基态状态。提出了一个模型，该模型考虑了长期存在的三胞胎状态通过与其他三胞胎状态的自我交往或与分子AR $ _2^+$ ions的互动。该模型可以预测闪烁信号的时间曲线及其对外部电场强度和沉积能量密度的依赖性，如果知道的快速和缓慢的组件的相对丰度已知。该模型成功地解释了慢速分量对施加电场强度的特征时间的实验观察到的依赖性，以及当用少量氙气掺杂时（在PPM水平上）时，液体氩气的光子产量增加。该模型还预测了电子和核后坐力的脉冲形状参数f $ _ {strive} $的依赖性，对后坐力和核后坐力的行为以及液体液体中核后坐力的相对光收益的行为，$ \ MATHCAL {l} _ {l} _ {eff} $
Liquid argon is used as active medium in a variety of neutrino and Dark Matter experiments thanks to its excellent properties of charge yield and transport and as a scintillator. Liquid argon scintillation photons are emitted in a narrow band of 10~nm centered around 127 nm and with a characteristic time profile made by two components originated by the decay of the lowest lying singlet and triplet state of the excimer Ar$_2^*$ to the dissociative ground state. A model is proposed which takes into account the quenching of the long lived triplet states through the self-interaction with other triplet states or through the interaction with molecular Ar$_2^+$ ions. The model predicts the time profile of the scintillation signals and its dependence on the intensity of an external electric field and on the density of deposited energy, if the relative abundance of the unquenched fast and slow components is know. The model successfully explains the experimentally observed dependence of the characteristic time of the slow component on the intensity of the applied electric field and the increase of photon yield of liquid argon when doped with small quantities of xenon (at the ppm level). The model also predicts the dependence of the pulse shape parameter, F$_{prompt}$, for electron and nuclear recoils on the recoil energy and the behavior of the relative light yield of nuclear recoils in liquid argon, $\mathcal{L}_{eff}$
