Refurbishment of KamLAND outer detector

H. Ozaki; J. Shirai

Refurbishment of KamLAND outer detector

Research Center for Neutrino Science (RCNS)

Research output: Contribution to journal › Conference article › peer-review

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 detector (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 January 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%.

Original language	English
Journal	Proceedings of Science
Volume	Part F128556
Publication status	Published - 2016 Jan 1
Event	38th International Conference on High Energy Physics, ICHEP 2016 - Chicago, United States Duration: 2016 Aug 3 → 2016 Aug 10

ASJC Scopus subject areas

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title = "Refurbishment of KamLAND outer detector",

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 detector (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 January 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%.",

author = "H. Ozaki and J. Shirai",

year = "2016",

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language = "English",

volume = "Part F128556",

journal = "Proceedings of Science",

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note = "38th International Conference on High Energy Physics, ICHEP 2016 ; Conference date: 03-08-2016 Through 10-08-2016",

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T1 - Refurbishment of KamLAND outer detector

AU - Ozaki, H.

AU - Shirai, J.

PY - 2016/1/1

Y1 - 2016/1/1

N2 - 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 detector (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 January 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%.

AB - 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 detector (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 January 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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M3 - Conference article

AN - SCOPUS:85025828028

VL - Part F128556

JO - Proceedings of Science

JF - Proceedings of Science

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T2 - 38th International Conference on High Energy Physics, ICHEP 2016

Y2 - 3 August 2016 through 10 August 2016

ER -

Refurbishment of KamLAND outer detector

Abstract

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