Measurement of the scintillation and ionization response of liquid xenon at MeV energies in the EXO-200 experiment
Measurement of the scintillation and ionization response of liquid xenon at MeV energies in the EXO-200 experiment
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DOI：
10.1103/physrevc.101.065501
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发表时间：
2020-06-15
影响因子：
3.1
通讯作者：
Ziegler, T.
中科院分区：
文献类型：
--
作者：
Anton, G.;Badhrees, I;Ziegler, T.
液态氙（LXe）被用于当前和未来的一些罕见事件探测中。我们使用EXO-200实验数据测量了Th-228 (2615 keV), Ra-226 （1764 keV）和Co-60 （1332 keV和1173 keV）校准源在一定电场范围内的伽马相互作用产生的绝对闪烁和电离产率。定义与重组无关的能量尺度的W值测量为11.5 +/- 0.5（系统）。+/- 0.1（统计）eV这些数据还用于测量MeV尺度上校准源产生的电子和光子数量的重组波动，这些波动偏离了低能量数据的外推。此外，建立了探测器能量分辨率的半经验模型，该模型用于约束复合效率，即导致可探测光子发射的重组电子的比例。mev尺度电子反冲的绝对电荷和光产率的详细测量对于预测未来的中微子双β衰变探测器的性能非常重要。
Liquid xenon (LXe) is employed in a number of current and future detectors for rare event searches. We use the EXO-200 experimental data to measure the absolute scintillation and ionization yields generated by gamma interactions from Th-228 (2615 keV), Ra-226 (1764 keV), and Co-60 (1332 keV and 1173 keV) calibration sources, over a range of electric fields. The W value that defines the recombination-independent energy scale is measured to be 11.5 +/- 0.5 (syst.) +/- 0.1 (stat.) eV. These data are also used to measure the recombination fluctuations in the number of electrons and photons produced by the calibration sources at the MeV scale, which deviate from extrapolations of lower-energy data. Additionally, a semiempirical model for the energy resolution of the detector is developed, which is used to constrain the recombination efficiency, i.e., the fraction of recombined electrons that result in the emission of a detectable photon. Detailed measurements of the absolute charge and light yields for MeV-scale electron recoils are important for predicting the performance of future neutrinoless double beta-decay detectors.