TY - JOUR
T1 - Inner balloon production for KamLAND-Zen 800
AU - KamLAND-Zen Collaboration
AU - Gando, A.
AU - Gando, Y.
AU - Hachiya, T.
AU - Hayashida, S.
AU - Hosokawa, K.
AU - Ikeda, H.
AU - Obara, S.
AU - Ozaki, H.
AU - Ueshima, K.
AU - Watanabe, H.
N1 - Publisher Copyright:
© Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under licence by IOP Publishing Ltd
PY - 2020/3/20
Y1 - 2020/3/20
N2 - KamLAND-Zen searches for neutrinoless double-beta decay with 136Xe loaded liquid scintillator (LS). The LS container, a 25-µm-thick clean nylon inner balloon is a key of the experiment since one of the main backgrounds in the ROI is 214Bi from the inner balloon. In KamLAND-Zen 400 (operated from 2011 to 2015), dust contamination of the inner balloon from the environment limited the sensitivity, although the inner balloon was fabricated at a class-1 super clean room. We improved the production method of the inner balloon for KamLAND-Zen 800 (started DAQ in January, 2019) and successfully reduced the 214Bi background level to one fifteenth as compared to the 2nd phase of KamLAND-Zen 400. The inner balloon film material and requirements, improved fabrication scheme, including establishment of clean environment and dust control, will be described.
AB - KamLAND-Zen searches for neutrinoless double-beta decay with 136Xe loaded liquid scintillator (LS). The LS container, a 25-µm-thick clean nylon inner balloon is a key of the experiment since one of the main backgrounds in the ROI is 214Bi from the inner balloon. In KamLAND-Zen 400 (operated from 2011 to 2015), dust contamination of the inner balloon from the environment limited the sensitivity, although the inner balloon was fabricated at a class-1 super clean room. We improved the production method of the inner balloon for KamLAND-Zen 800 (started DAQ in January, 2019) and successfully reduced the 214Bi background level to one fifteenth as compared to the 2nd phase of KamLAND-Zen 400. The inner balloon film material and requirements, improved fabrication scheme, including establishment of clean environment and dust control, will be described.
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U2 - 10.1088/1742-6596/1468/1/012145
DO - 10.1088/1742-6596/1468/1/012145
M3 - Conference article
AN - SCOPUS:85089561772
SN - 1742-6588
VL - 1468
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 1
M1 - 012145
T2 - 16th International Conference on Topics in Astroparticle and Underground Physics, TAUP 2019
Y2 - 9 September 2019 through 13 September 2019
ER -