Liquid xenon scintillation measurements and pulse shape discrimination in the LUX dark matter detector
Liquid xenon scintillation measurements and pulse shape discrimination in the LUX dark matter detector
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DOI：
10.1103/physrevd.97.112002
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发表时间：
2018-02
影响因子：
5
通讯作者：
D. Akerib;S. Alsum;H. Araújo;X. Bai;A. J. Bailey;J. Balajthy;P. Beltrame;E. Bernard;A. Bernstein;T. Biesiadzinski;E. Boulton;P. Br'as;D. Byram;M. Carmona-Benitez;C. Chan;A. Currie;J. Cutter;T. Davison;A. Dobi;E. Druszkiewicz;B. Edwards;S. Fallon;A. Fan;S. Fiorucci;R. Gaitskell;J. Genovesi;C. Ghag;M. Gilchriese;C. Hall;S. Haselschwardt;S. A. Hertel;D. Hogan;M. Horn;D. Huang;C. Ignarra;R. Jacobsen;W. Ji;K. Kamdin;K. Kazkaz;D. Khaitan;R. Knoche;B. Lenardo;K. Lesko;J. Liao;A. Lindote;M. Lopes;A. Manalaysay;R. Mannino;M. F. Marzioni;D. Mckinsey;D. Mei;J. Mock;M. Moongweluwan;J. Morad;A. Murphy;C. Nehrkorn;H. Nelson;F. Neves;K. O'Sullivan;K. Oliver-Mallory;K. Palladino;E. K. Pease;C. Rhyne;S. Shaw;T. Shutt;C. Silva;M. Solmaz;V. Solovov;P. Sorensen;T. Sumner;M. Szydagis;D. Taylor;W. Taylor;B. Tennyson;P. Terman;D. Tiedt;W. To;M. Tripathi;L. Tvrznikova;U. Utku;S. Uvarov;V. Velan;J. Verbus;R. Webb;J. White;T. J. Whitis;M. Witherell;F. Wolfs;J. Xu;K. Yazdani;S. K. Young;C. Zhang
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文献类型：
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作者：
D. Akerib;S. Alsum;H. Araújo;X. Bai;A. J. Bailey;J. Balajthy;P. Beltrame;E. Bernard;A. Bernstein;T. Biesiadzinski;E. Boulton;P. Br'as;D. Byram;M. Carmona-Benitez;C. Chan;A. Currie;J. Cutter;T. Davison;A. Dobi;E. Druszkiewicz;B. Edwards;S. Fallon;A. Fan;S. Fiorucci;R. Gaitskell;J. Genovesi;C. Ghag;M. Gilchriese;C. Hall;S. Haselschwardt;S. A. Hertel;D. Hogan;M. Horn;D. Huang;C. Ignarra;R. Jacobsen;W. Ji;K. Kamdin;K. Kazkaz;D. Khaitan;R. Knoche;B. Lenardo;K. Lesko;J. Liao;A. Lindote;M. Lopes;A. Manalaysay;R. Mannino;M. F. Marzioni;D. Mckinsey;D. Mei;J. Mock;M. Moongweluwan;J. Morad;A. Murphy;C. Nehrkorn;H. Nelson;F. Neves;K. O'Sullivan;K. Oliver-Mallory;K. Palladino;E. K. Pease;C. Rhyne;S. Shaw;T. Shutt;C. Silva;M. Solmaz;V. Solovov;P. Sorensen;T. Sumner;M. Szydagis;D. Taylor;W. Taylor;B. Tennyson;P. Terman;D. Tiedt;W. To;M. Tripathi;L. Tvrznikova;U. Utku;S. Uvarov;V. Velan;J. Verbus;R. Webb;J. White;T. J. Whitis;M. Witherell;F. Wolfs;J. Xu;K. Yazdani;S. K. Young;C. Zhang
弱相互作用大质量粒子（WIMPs）是暗物质的主要候选者，预计将在液体氙时间投影室中产生核反冲（NR）事件。我们提出了一种测量液体氙闪烁特性的LUX暗物质探测器，并开发了一个脉冲成形的歧视参数用于粒子识别。为了准确测量闪烁特性，我们发展了一种模板拟合的方法来重建光子的探测时间。分析2013-16 LUX WIMP搜索期间收集的校准数据，我们测量了电子反冲（ER）的单线态到三线态闪烁比，这与现有文献一致，并且我们首次测量了反冲能量低于74 keV的NR单线态到三线态比。一个即时分数歧视参数利用NR和ER事件的光子时间谱的差异，并进行优化，以具有最少数量的ER事件发生在50\% NR接受区域。当这个EQUIPMENT是结合使用的电荷到光的歧视的校准数据，在NR暗物质接受区域的信噪比增加了高达两个因素。
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 liquid xenon scintillation characteristics in the LUX dark matter detector and develop a pulse shaped based discrimination parameter to be used for particle identification. To accurately measure the scintillation characteristics, we develop a template-fitting method to reconstruct the detection time of photons. Analyzing calibration data collected during the 2013-16 LUX WIMP search, we measure a singlet-to-triplet scintillation ratio for electron recoils (ER) that is consistent with existing literature, and we make a first-ever measurement of the NR singlet-to-triplet ratio at recoil energies below 74 keV. A prompt fraction discrimination parameter exploits the difference of the photon time spectra for NR and ER events and is optimized to have the least number of ER events that occur in the 50\% NR acceptance region. When this discriminator is used in conjunction with charge-to-light discrimination on the calibration data, the signal-to-noise ratio in the NR dark matter acceptance region increases by up to a factor of two.