The MiniCLEAN single-phase noble liquid dark matter experiment
The MiniCLEAN single-phase noble liquid dark matter experiment
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MiniCLEAN 单相惰性液体暗物质实验
DOI：
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发表时间：
2010
期刊：
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通讯作者：
M. Ronquest
中科院分区：
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作者：
M. Ronquest
MiniCLEAN是一个单相贵液WIMP暗物质实验，它只观察500公斤液态氩靶的闪烁光，允许探测器设计可以放大到50吨或更多的目标。MiniCLEAN的目标是通过一个由92个光电倍增管组成的球体来观察的，该球体覆盖近4π的立体角，产生的投影光产量优于每keV 5个光电子，而探测器边缘的3D位置分辨率则优于50 mm。高的光产额也将有利于利用脉冲形状鉴别，以便完全分离背景电子反冲事件与核反冲，这将构成WIMP信号。该实验还可以利用液体氖作为目标，在正信号的情况下，这将允许探测WIMP相互作用速率中的预期A2依赖性，以及产生非常不同的固有背景特性。对于100 GeV的WIMP，在使用LAr靶运行两年后，MiniCLEAN对自旋无关的WIMP-核子弹性截面的预计灵敏度约为2 × 10 - 45 cm 3。本次演讲将审查的实验技术，工程设计和MiniCLEAN探测器的当前组装状态，除了氩和氖的闪烁特性的测量的当前状态。
MiniCLEAN is a single-phase noble-liquid WIMP dark matter experiment which observes only the scintillation light from a 500kg liquid argon target, allowing a detector design which can be scaled up to targets of 50 tons or more. MiniCLEAN's target is observed by a sphere of 92 photomultiplier tubes covering nearly 4π in solid angle, producing a projected light yield of better than 5 photoelectrons per keV and in turn a 3D position resolution of better than 50 mm at the edge of the detector. The high light yield will also benefit the utilization of pulse shape discrimination in order to fully separate background electron recoil events from nuclear recoils which would constitute the WIMP signal. The experiment can also utilize liquid neon as a target, which in the event of a positive signal will allow the expected A2 dependence in the WIMP interaction rate to be probed, as well as produce very different intrinsic background characteristics. MiniCLEAN's projected sensitivity to the spin-independent WIMP-nucleon elastic cross section is roughly 2 × 10−45 cm3 for a 100 GeV WIMP after two years of running with a LAr target. This talk will review the experimental technique, engineering design and current assembly status of the MiniCLEAN detector, in addition to the current status of measurements of the scintillation characteristics of argon and neon.