arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1802.06162physics.ins-det
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在LUX暗物质探测器中的液体氙闪烁测量和脉冲形状鉴别

Liquid xenon scintillation measurements and pulse shape discrimination in the LUX dark matter detector

The LUX Collaboration, D. S. Akerib, S. Alsum, H. M. Araújo, X. Bai, A. J. Bailey, J. Balajthy, P. Beltrame, E. P. Bernard, A. Bernstein, T. P. Biesiadzinski, E… 展开作者

The LUX Collaboration, D. S. Akerib, S. Alsum, H. M. Araújo, X. Bai, A. J. Bailey, J. Balajthy, P. Beltrame, E. P. Bernard, A. Bernstein, T. P. Biesiadzinski, E. M. Boulton, P. Brás, D. Byram, M. C. Carmona-Benitez, C. Chan, A. Currie, J. E. Cutter, T. J. R. Davison, A. Dobi, E. Druszkiewicz, B. N. Edwards, S. R. Fallon, A. Fan, S. Fiorucci, R. J. Gaitskell, J. Genovesi, C. Ghag, M. G. D. Gilchriese, C. R. Hall, S. J. Haselschwardt, S. A. Hertel, D. P. Hogan, M. Horn, D. Q. Huang, C. M. Ignarra, R. G. Jacobsen, W. Ji, K. Kamdin, K. Kazkaz, D. Khaitan, R. Knoche, B. G. Lenardo, K. T. Lesko, J. Liao, A. Lindote, M. I. Lopes, A. Manalaysay, R. L. Mannino, M. F. Marzioni, D. N. McKinsey, D. M. Mei, J. Mock, M. Moongweluwan, J. A. Morad, A. St. J. Murphy, C. Nehrkorn, H. N. Nelson, F. Neves, K. O'Sullivan, K. C. Oliver-Mallory, K. J. Palladino, E. K. Pease, C. Rhyne, S. Shaw, T. A. Shutt, C. Silva, M. Solmaz, V. N. Solovov, P. Sorensen, T. J. Sumner, M. Szydagis, D. J. Taylor, W. C. Taylor, B. P. Tennyson, P. A. Terman, D. R. Tiedt, W. H. To, M. Tripathi, L. Tvrznikova, U. Utku, S. Uvarov, V. Velan, J. R. Verbus, R. C. Webb, J. T. White, T. J. Whitis, M. S. Witherell, F. L. H. Wolfs, J. Xu, K. Yazdani, S. K. Young, C. Zhang

摘要:

弱相互作用大质量粒子(WIMPs)是暗物质的主要候选者,并有望在液体氙时间投影室内产生核反冲(NR)事件。我们提出了一个测量的闪烁时间特性的液体氙在LUX暗物质探测器和开发的脉冲形状判别用于粒子识别。为了准确测量光子的时间特性,我们提出了一种模板拟合的方法来重建光子的探测时间。通过分析2013-16 LUX WIMP搜索期间收集的校准数据,我们提供了一个新的测量电子反冲(ER)低于46 keV的单重态与三重态闪烁比,我们首次测量了反冲能量低于74 keV的NR单重态与三重态闪烁比。我们利用NR和ER事件的光子时间谱的差异,通过使用即时分数歧视参数,这是使用校准数据进行优化,有最少数量的ER事件发生在50\% NR接受区域。然后,我们演示了如何判别可以与电荷到光的歧视,以可能提高核反冲的信噪比结合使用。

英文摘要:

Weakly Interacting Massive Particles (WIMPs) are a leading candidate for dark matter and are expected to produce nuclear recoil (NR) events within liquid xenon time-projection chambers. We present a measurement of the scintillation timing characteristics of liquid xenon in the LUX dark matter detector and develop a pulse shape discriminant to be used for particle identification. To accurately measure the timing characteristics, we develop a template-fitting method to reconstruct the detection times of photons. Analyzing calibration data collected during the 2013-16 LUX WIMP search, we provide a new measurement of the singlet-to-triplet scintillation ratio for electron recoils (ER) below 46~keV, and we make a first-ever measurement of the NR singlet-to-triplet ratio at recoil energies below 74~keV. We exploit the difference of the photon time spectra for NR and ER events by using a prompt fraction discrimination parameter, which is optimized using calibration data to have the least number of ER events that occur in a 50\% NR acceptance region. We then demonstrate how this discriminant can be used in conjunction with the charge-to-light discrimination to possibly improve the signal-to-noise ratio for nuclear recoils.

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