两相氙时间投影室中电子反冲与核反冲的甄别
仪器与探测器
2020-12-11 v3 高能物理 - 实验
核实验
摘要
我们基于大型地下氙（LUX）实验 2013 年与 2014-16 年运行的标定数据，对液/气氙时间投影室中的电子反冲与核反冲甄别进行了全面分析。我们观察到电荷-光信号甄别随事件能量增加而显著增强。对于 S1 = 120 个探测光子的事件（即相当于 100 keV 的核反冲能量），在 50% 核反冲信号接受度下，我们观测到电子反冲本底接受度 。我们还观察到甄别能力对电场有轻微依赖，在本研究探索的电场范围（50-500 V/cm）内于约 300 V/cm 处达到峰值。在 S1 = 1-80 phd 的 WIMP 搜索区域，我们观测到的最小电子反冲泄漏为 ，其对应于 240-290 V/cm 的漂移场。利用脉冲形状甄别改进了我们的结果，并且我们发现，在低能量和低场下，本底泄漏额外降低了最多 3 倍。我们开发了复合涨落的实证模型，当其与 Noble Element Scintillation Technique（NEST）模拟包一同使用时，能正确再现电子反冲数据的偏度。我们利用此更新后的模拟研究了电子反冲带的宽度，发现其主要贡献来自电子-离子复合涨落，其后按贡献大小依次为 S1 信号涨落、S2 信号涨落，以及给定能量沉积中产生的总量子数涨落。
引用
@article{arxiv.2004.06304,
title = {Discrimination of electronic recoils from nuclear recoils in two-phase xenon time projection chambers},
author = {LUX Collaboration and D. S. Akerib and S. Alsum and H. M. Araújo and X. Bai and J. Balajthy and A. Baxter and E. P. Bernard and A. Bernstein and T. P. Biesiadzinski and E. M. Boulton and B. Boxer and P. Brás and S. Burdin and D. Byram and M. C. Carmona-Benitez and C. Chan and J. E. Cutter and L. de Viveiros and E. Druszkiewicz and A. Fan and S. Fiorucci and R. J. Gaitskell and C. Ghag and M. G. D. Gilchriese and C. Gwilliam and C. R. Hall and S. J. Haselschwardt and S. A. Hertel and D. P. Hogan and M. Horn and D. Q. Huang and C. M. Ignarra and R. G. Jacobsen and O. Jahangir and W. Ji and K. Kamdin and K. Kazkaz and D. Khaitan and E. V. Korolkova and S. Kravitz and V. A. Kudryavtsev and E. Leason and B. G. Lenardo and K. T. Lesko and J. Liao and J. Lin and A. Lindote and M. I. Lopes and A. Manalaysay and R. L. Mannino and N. Marangou and D. N. McKinsey and D. -M. Mei and M. Moongweluwan and J. A. Morad and A. St. J. Murphy and A. Naylor and C. Nehrkorn and H. N. Nelson and F. Neves and A. Nilima and K. C. Oliver-Mallory and K. J. Palladino and E. K. Pease and Q. Riffard and G. R. C. Rischbieter and C. Rhyne and P. Rossiter and S. Shaw and T. A. Shutt and C. Silva and M. Solmaz and V. N. Solovov and P. Sorensen and T. J. Sumner and M. Szydagis and D. J. Taylor and R. Taylor and W. C. Taylor and B. P. Tennyson and P. A. Terman and D. R. Tiedt and W. H. To and L. Tvrznikova and U. Utku and S. Uvarov and A. Vacheret and V. Velan and R. C. Webb and J. T. White and T. J. Whitis and M. S. Witherell and F. L. H. Wolfs and D. Woodward and J. Xu and C. Zhang},
journal= {arXiv preprint arXiv:2004.06304},
year = {2020}
}
备注
29 pages, 33 figures; minor typos corrected, references updated