The LUX-ZEPLIN experiment will search for dark matter particle interactions with a detector containing a total of 10 tonnes of liquid xenon. Surrounding the liquid xenon cryostat is an outer detector veto system with the primary aim of vetoing neutron single-scatter events in the liquid xenon that could mimic a weakly interacting massive particle (WIMP) dark matter signal. The outer detector consists of approximately 17 tonnes of gadolinium-loaded liquid scintillator confined to 10 acrylic tanks surrounding the cryostat and 228,000 litres of water as the outermost layer. It will be monitored by 120 inward-facing 8-inch photomultiplier tubes. An optical calibration system has been designed and built to calibrate and monitor these photomultiplier tubes allowing the veto system to reach its required efficiency and thus ensuring that LUX-ZEPLIN meets its target sensitivity.
Study of few-electron backgrounds in the LUX-ZEPLIN detector
SLAC National Accelerator Laboratory（斯坦福直线加速器中心）；Kavli Institute for Particle Astrophysics and Cosmology, Stanford University（斯坦福大学卡弗里粒子天体物理与宇宙学研究所）；University College London (UCL)（伦敦大学学院）；Brown University（布朗大学）；University of California, Santa Barbara（加州大学圣塔芭芭拉分校）；Imperial College London（帝国理工学院）；STFC Rutherford Appleton Laboratory (RAL)（英国科学与技术设施委员会卢瑟福阿普尔顿实验室）；University of Maryland（马里兰大学）
我们描述的设计和组装的LUX-ZEPLIN实验，直接探测宇宙WIMP暗物质粒子的搜索。实验的核心是一个对低能核反冲敏感的大型液体氙时间投影室。背景的拒绝是由一个反渗透探测器和一个液体闪烁体外部探测器装有有效的中子捕获和标记钆增强。LZ位于美国南达科他州Lead的Sanford Underground Research Facility的4850'层的戴维斯洞穴中。我们描述了实验的主要子系统及其关键设计特点和要求。
