PoS - Proceedings of Science
Volume 282 - 38th International Conference on High Energy Physics (ICHEP2016) - Poster Session
Refurbishment of KamLAND outer detector
H. Ozaki,* J. Shirai on behalf of the KamLAND Collaboration
*corresponding author
Full text: pdf
Pre-published on: February 06, 2017
Published on: April 19, 2017
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%.
DOI: https://doi.org/10.22323/1.282.1161
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