Liquid argon scintillation response to electronic recoils between 2.8?1275?keV in a high light yield single-phase detector
Liquid argon scintillation response to electronic recoils between 2.8?1275?keV in a high light yield single-phase detector
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高光产单相探测器中液氩闪烁对 2.8?1275?keV 电子反冲的响应
DOI：
10.1103/physrevd.102.092008
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发表时间：
2020
影响因子：
5
通讯作者：
Yorita K.
中科院分区：
文献类型：
--
作者：
Kimura M.;Aoyama K.;Tanaka M.;Yorita K.
我们测量了零电场下能量范围为2.82 ~ 1274.6keV的电子反冲引起的液氩闪烁响应。该测量中使用的具有大光学覆盖范围的单相探测器基于光电倍增管单光电子响应建模，使用高斯加上附加指数项（仅使用高斯项），产生511.0 keV射线事件。它暴露在各种校准源中，如中子和射线发射器，以及通过聚四氟乙烯内的反应诱导准单能射线的快中子发射器。此外，高的光探测效率的探测器，使识别的2.82千电子伏的峰值，宇宙成因的同位素在大气中的氩。由全吸收峰得到了探测器的光产额和能量分辨率。我们发现高达约25%的移位在整个能量范围内的闪烁产率和3%的能量分辨率为511.0千电子伏线。用常数参数的Mesquas-Imel箱模型解释了这一现象。对于液态氩，这是第一次测量的能量依赖的闪烁产额下降到几个千电子伏在零场，并提供必要的输入调整氩响应模型用于物理实验。
We measure the liquid argon scintillation response to electronic recoils in the energy range of 2.82 to 1274.6 keV at null electric field. The single-phase detector with a large optical coverage used in this measurement yieldsfor 511.0-keV-ray events based on a photomultiplier tube single photoelectron response modeling with a Gaussian plus an additional exponential term (with only a Gaussian term). It is exposed to a variety of calibration sources such asand-ray emitters, and afast neutron emitter that induces quasimonoenergeticrays through areaction within polytetrafluoroethylene. In addition, the high light detection efficiency of the detector enables identification of the 2.82-keV peak of, a cosmogenic isotope in atmospheric argon. The observed light yield and energy resolution of the detector are obtained by the full-absorption peaks. We find up to approximately 25% shift in the scintillation yield across the energy range and 3% of the energy resolution for the 511.0-keV line. The Thomas-Imel box model with its constant parameteris found to explain the result. For liquid argon, this is the first measurement on the energy-dependent scintillation yield down to a few keV at null field and provides essential inputs for tuning the argon response model to be used for physics experiments.