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    • Refurbishment of KamLAND Outer Detector

    Hideyoshi Ozaki,Junpei Shirai

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

    Cited 5|Views6
    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%。