论文标题
DEAP-3600中的液体阿贡闪烁脉冲
The liquid-argon scintillation pulseshape in DEAP-3600
论文作者
论文摘要
DEAP-3600是一种液体 - 阿贡闪烁检测器,寻找暗物质。液体氩气(LAR)中的闪烁事件由255个光电层管(PMTS)注册,使用脉冲壳区分(PSD)来抑制电磁背景事件。 LAR的出色PSD性能使其成为暗物质搜索的可行目标,而这里讨论的LAR闪烁脉冲是PSD的基础。 观察到的脉冲膜是LAR闪烁物理学具有检测器效应的组合。我们提出了一个模型,用于暗物质搜索感兴趣的能量区域中电磁背景事件的脉冲。该模型由a)lar闪烁物理学组成,包括所谓的中间成分,b)TPB波长换档器的时间响应,包括在$ \ mathcal o $ $ $ $ $ $(MS)时间尺度和c)PMT响应的延迟TPB发射。 TPB是大多数LAR检测器中选择的波长变速杆。我们发现,波长移位光强度的大约10%处于TPB的长期状态。这会导致事件从事件中溢出到后续事件中,通常在一定程度上不考虑基于LAR的检测器的设计和数据分析。
DEAP-3600 is a liquid-argon scintillation detector looking for dark matter. Scintillation events in the liquid argon (LAr) are registered by 255 photomultiplier tubes (PMTs), and pulseshape discrimination (PSD) is used to suppress electromagnetic background events. The excellent PSD performance of LAr makes it a viable target for dark matter searches, and the LAr scintillation pulseshape discussed here is the basis of PSD. The observed pulseshape is a combination of LAr scintillation physics with detector effects. We present a model for the pulseshape of electromagnetic background events in the energy region of interest for dark matter searches. The model is composed of a) LAr scintillation physics, including the so-called intermediate component, b) the time response of the TPB wavelength shifter, including delayed TPB emission at $\mathcal O$(ms) time-scales, and c) PMT response. TPB is the wavelength shifter of choice in most LAr detectors. We find that approximately 10\% of the intensity of the wavelength-shifted light is in a long-lived state of TPB. This causes light from an event to spill into subsequent events to an extent not usually accounted for in the design and data analysis of LAr-based detectors.