Discrimination of electronic recoils from nuclear recoils in two-phase xenon time projection chambers-猫眼课题宝

DOI：

10.1103/physrevd.102.112002

发表时间：

2020-04

期刊：

Physical Review D

影响因子：

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

D. Akerib;S. Alsum;H. Araújo;X. Bai;J. Balajthy;A. Baxter;E. Bernard;A. Bernstein;T. Biesiadzinski;E. Boulton;B. Boxer;P. Br'as;S. Burdin;D. Byram;M. Carmona-Benitez;C. Chan;J. Cutter;L. de Viveiros;E. Druszkiewicz;A. Fan;S. Fiorucci;R. Gaitskell;C. Ghag;M. Gilchriese;C. Gwilliam;C. Hall;S. Haselschwardt;S. Hertel;D. Hogan;M. Horn;D. Huang;C. Ignarra;R. Jacobsen;O. Jahangir;W. Ji;K. Kamdin;K. Kazkaz;D. Khaitan;E. Korolkova;S. Kravitz;V. Kudryavtsev;E. Leason;B. Lenardo;K. Lesko;J. Liao;J. Lin;A. Lindote;M. Lopes;A. Manalaysay;R. Mannino;N. Marangou;D. Mckinsey;D. Mei;M. Moongweluwan;J. Morad;A. Murphy;A. Naylor;C. Nehrkorn;H. Nelson;F. Neves;A. Nilima;K. Oliver-Mallory;K. Palladino;E. K. Pease;Q. Riffard;G. Rischbieter;C. Rhyne;P. Rossiter;S. Shaw;T. Shutt;C. Silva;M. Solmaz;V. Solovov;P. Sorensen;T. Sumner;M. Szydagis;D. Taylor;R. Taylor;W. Taylor;B. Tennyson;P. Terman;D. Tiedt;W. To;L. Tvrznikova;U. Utku;S. Uvarov;A. Vacheret;V. Velan;R. Webb;J. White;T. J. Whitis;M. Witherell;F. Wolfs;D. Woodward;J. Xu;C. Zhang

本文利用2013年和2014-16年大型地下氙气（LUX）实验的校准数据，对液/气氙气时间投影室中的电子反冲与核反冲判别进行了全面分析。我们观察到随着事件能量的增加，电荷对光的分辨增强。对于S1 = 120探测光子的事件，即相当于100 keV的核反冲能量，我们观察到在核反冲信号接受度为50%时，电子反冲背景接受度为$<10^{-5}$。我们还观察到识别功率对电场的适度依赖，在本研究探索的电场范围（50-500 V/cm）中，在约300 V/cm的电场处达到峰值。在S1 = 1 ~ 80 phd的WIMP搜索区，我们观测到的最小电子后蹲漏为${(7.3\pm0.6)\times10^{-4}}$，这是在240 ~ 290 V/cm的漂移场下得到的。利用脉冲形状判别来改进我们的结果，我们发现，在低能量和低场下，背景泄漏的额外减少高达3倍。我们开发了一个重组波动的经验模型，当与惰性元素闪烁技术（NEST）模拟包一起使用时，该模型正确地再现了电子反冲数据的偏度。我们使用这个更新的模拟来研究电子反冲带的宽度，发现其主要贡献来自电子-离子复合波动，其次是S1信号的波动，S2信号的波动，以及给定能量沉积产生的量子总数的波动。

We present a comprehensive analysis of electronic recoil vs. nuclear recoil discrimination in liquid/gas xenon time projection chambers, using calibration data from the 2013 and 2014-16 runs of the Large Underground Xenon (LUX) experiment. We observe strong charge-to-light discrimination enhancement with increased event energy. For events with S1 = 120 detected photons, i.e. equivalent to a nuclear recoil energy of $\sim$100 keV, we observe an electronic recoil background acceptance of $<10^{-5}$ at a nuclear recoil signal acceptance of 50%. We also observe modest electric field dependence of the discrimination power, which peaks at a field of around 300 V/cm over the range of fields explored in this study (50-500 V/cm). In the WIMP search region of S1 = 1-80 phd, the minimum electronic recoil leakage we observe is ${(7.3\pm0.6)\times10^{-4}}$, which is obtained for a drift field of 240-290 V/cm. Pulse shape discrimination is utilized to improve our results, and we find that, at low energies and low fields, there is an additional reduction in background leakage by a factor of up to 3. We develop an empirical model for recombination fluctuations which, when used alongside the Noble Element Scintillation Technique (NEST) simulation package, correctly reproduces the skewness of the electronic recoil data. We use this updated simulation to study the width of the electronic recoil band, finding that its dominant contribution comes from electron-ion recombination fluctuations, followed in magnitude of contribution by fluctuations in the S1 signal, fluctuations in the S2 signal, and fluctuations in the total number of quanta produced for a given energy deposition.

Discrimination of electronic recoils from nuclear recoils in two-phase xenon time projection chambers

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