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Refurbishment of KamLAND Outer Detector

Proceedings of 38th International Conference on High Energy Physics — PoS(ICHEP2016)(2017)

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Abstract
KamLAND, a large size liquid scintillator detector for anti-neutrino detection, has observed the reactor neutrino oscillation and geo-neutrinos since its operation started in 2002. The outer de- tector (OD) is a water Cherenkov detector with 3,200 m3 of water and 225 Kamiokande-PMTs serving as the veto counter against the cosmic-ray muons. Muon tagging efficiency of the OD has been decreasing since 2010 because of a gradual increase of PMT failures, which results in the increase of muon-induced backgrounds. We have carried out a refurbishment of the OD from Jan- uary to April in 2016 by replacing the PMTs and improving light collection in the less-sensitive equator region. As a result, we achieved a recovery of the OD detection efficiency of muons equal to 99.8%.
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Neutrino Detection,Scintillation Detectors,Neutron Detection,Semiconductor Thermal Neutron Detectors
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要点】:论文介绍了对KamLAND外探测器进行翻新,通过更换PMTs和提高光收集效率,恢复了其对于宇宙射线μ子的检测效率至99.8%,以降低本底噪声,提高实验精度。

方法】:作者采取了对探测器中的光电倍增管(PMTs)进行更换以及优化了光收集效率的方法,特别是在探测器灵敏度较低的赤道区域。

实验】:2016年1月至4月对KamLAND外探测器进行了翻新,使用的数据集为探测器在翻新前后的μ子检测效率数据,翻新后μ子检测效率恢复至99.8%。