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Shirai, KamLAND-Zen collaboration : Y. Gando, K. Fushimi, K. Hata, K. Hosokawa, K. Inoue, K. Ishidoshiro, K. Kamizawa, K. Nakamura, K. Nemoto, K. Soma, K. Tamae, K. Ueshima, L.A. Winslow, M. Koga, M.P. Decowski, N. Kawada, N. Ota, S. Abe, S. Dell'Oro, S. Enomoto, S. Fraker, S. Hayashida, S. Hirata, S. Ieki, S. Ishikawa, S. Matsuda, S. Obara, S. Otsuka, S. Umehara, S. Yoshida, T. Hachiya, T. Kinoshita, T. Mitsui, T. Nakada, T. O'Donnell, T. Takai, W. Tornow, Y. Efremenko, Y. Honda, Y. Kamei, Y. Karino, Y. Shibukawa, Y. Shirahata, Y. Takemoto, Y. Teraoka, Y. Wada","submitted_at":"2021-04-21T10:42:18Z","abstract_excerpt":"The KamLAND-Zen 800 experiment is searching for the neutrinoless double-beta decay of $^{136}$Xe by using $^{136}$Xe-loaded liquid scintillator. The liquid scintillator is enclosed inside a balloon made of thin, transparent, low-radioactivity film that we call Inner Balloon (IB). 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