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Manly, S. Mine, S.M. Lakshmi, S. Moriyama, S. Nakayama, S. Parsa, S.P. Kasetti, S. Roth, S. Suvorov, S. Takayasu, S.Y. Suzuki, S. Zsoldos, T.A. Doyle, T. Arihara, T. Bonus, T. Dealtry, Th.A. Mueller, T. Hasegawa, The T2K Collaboration: K. Abe, T. Honjo, T. Ishida, T.J. Holvey, T. Kajita, T. Katori, T. Kikawa, T. Kobata, T. Kobayashi, T. Kutter, T. Lindner, T. Lux, T. Maruyama, T. Matsubara, T. Nakadaira, T. Nakaya, T. Odagawa, T. Ogawa, T. Okusawa, T. Radermacher, T. Sekiguchi, T. Towstego, T. Tsukamoto, T. Vladisavljevic, T.V. Ngoc, T. Wachala, T. Yano, T. Zhu, U. Yevarouskaya, V. Berardi, V. Glagolev, V. Matveev, V. Palladino, V. Paolone, V.Q. Nguyen, V.V. Tereshchenko, W.G.S. Vinning, W. Shorrock, W. Toki, X. Lu, X. Zhao, Y. Asada, Y. Ashida, Y. Fujii, Y. Fukuda, Y. Hayato, Y.-H. Xu, Y. Kataoka, Y. Katayama, Y. Koshio, Y. Kudenko, Y. Lee, Y. Nagai, Y. Nakajima, Y. Nakano, Y. Nishimura, Y. Oyama, Y. Seiya, Y. Sonoda, Y.S. Prabhu, Y. Suzuki, Y. Takeuchi, Y. Tanihara, Y. Uchida, Yu.I. Davydov, Y. Wang, Y. Yoshimoto","submitted_at":"2022-07-26T15:41:02Z","abstract_excerpt":"The T2K experiment widely uses plastic scintillator as a target for neutrino interactions and an active medium for the measurement of charged particles produced in neutrino interactions at its near detector complex. Over 10 years of operation the measured light yield recorded by the scintillator based subsystems has been observed to degrade by 0.9--2.2\\% per year. Extrapolation of the degradation rate through to 2040 indicates the recorded light yield should remain above the lower threshold used by the current reconstruction algorithms for all subsystems. 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Goodman, E.D. Zimmerman, E. Kearns, E. Mazzucato, E. Radicioni, E. Rondio, E.T. Atkin, F. Bench, F. Di Lodovico, F. Iacob, F.J.P. Soler, F. Nova, F. S\\'anchez, G.A. Fiorentini Aguirre, G. Barr, G. Christodoulou, G. Collazuol, G.C. Penn, G. De Rosa, G.D. Megias, G. Fiorillo, G.J. Barker, G. Kogan, G. Pintaudi, G. Santucci, G. Vasseur, G. Yang, G. Zarnecki, H. Kakuno, H. Kikutani, H.K. Tanaka, H.M. O'Keeffe, H. Nakamura, H. Sekiya, H. Sobel, H. Su, H.T. Israel, I.A. Suslov, I. Lamont, J. Chakrani, J.C. Nugent, J. Coleman, J. Dumarchez, J.F. Martin, J.G. Walsh, J. Holeczek, J.J. Jiang, J. Kameda, J. Kisiel, J. Lagoda, J. McElwee, J. Parlone, J. Pasternak, J.R. Wilson, J.T. Haigh, J.T. Sobczyk, J. Xia, J. Zalipska, K. Dygnarowicz, K.E. Duffy, K. Fusshoeller, K. Iwamoto, K. Kowalik, K. Mahn, K. Mavrokoridis, K.M. Tsui, K. Nagai, K. Nakagiri, K. Nakamura, K. Nakayoshi, K. Niewczas, K. Nishizaki, K. Okumura, K. Porwit, K.R. Long, K. Sakashita, K. Scholberg, K. Skwarczynski, K.S. McFarland, K. Wood, K. Yamamoto, K. Yasutome, K. Zaremba, L. Berns, L. Cook, L.F. Thompson, L. Koch, L. Labarga, L.L. Kormos, L. Ludovici, L. Magaletti, L. Marti-Magro, L. Mellet, L. Molina Bueno, L. Munteanu, L.N. Machado, L. O'Sullivan, L. Pickering, L. Wan, M. Antonova, M. Barbi, M. Batkiewicz-Kwasniak, M. Buizza Avanzini, M. Cicerchia, M. Friend, M.G. Catanesi, M. Gonin, M. Grassi, M. Guigue, M. Hartz, M. Hogan, M. Ikeda, M. Ishitsuka, M. Jakkapu, M.J. Wilking, M. Kabirnezhad, M. Kawaue, M. Khabibullin, M. Kuze, M. La Commara, M. Lamers James, M. Lamoureux, M. Laveder, M. Lawe, M. Malek, M. Mandal, M. Martini, M. Mezzetto, M. Miura, M. Nakahata, M.O. Wascko, M. Pari, M. Pavin, M. Posiadala-Zezula, M. Reh, M. Scott, M. Shiozawa, M. Smy, M. Tada, M. Tani, M. Tzanov, M. Vagins, M. Yokoyama, M. Yu, M. Ziembicki, M. Zito, N. Akhlaq, N.C. Hastings, N.F. Calabria, N. Izumi, N. Latham, N. McCauley, N. Teshima, N. Thamm, N.T. Hong Van, N. Yershov, O. Drapier, O. Mineev, P.B. Jurj, P. Dunne, P. Fernandez, P. Hamacher-Baumann, P. Jonsson, P. Novella, P.N. Ratoff, R. Akutsu, R.A. Owen, R. Kurjata, R. Okada, R.P. Litchfield, R. Spina, R. Wendell, R. Zaki, S. Aoki, S. Ban, S.B. Boyd, S. Bhadra, S. Bolognesi, S. Bordoni, S. Bron, S. Cao, S. Dolan, S. Emery-Schrenk, S. Fedotov, S. Hassani, S.J. Jenkins, S. King, S.-K. Lin, S. Kuribayashi, S.L. Cartwright, S.L. Liu, S. Manly, S. Mine, S.M. Lakshmi, S. Moriyama, S. Nakayama, S. Parsa, S.P. Kasetti, S. Roth, S. Suvorov, S. Takayasu, S.Y. Suzuki, S. Zsoldos, T.A. Doyle, T. Arihara, T. Bonus, T. Dealtry, Th.A. Mueller, T. Hasegawa, The T2K Collaboration: K. Abe, T. Honjo, T. Ishida, T.J. Holvey, T. Kajita, T. Katori, T. Kikawa, T. Kobata, T. Kobayashi, T. Kutter, T. Lindner, T. Lux, T. Maruyama, T. Matsubara, T. Nakadaira, T. Nakaya, T. Odagawa, T. Ogawa, T. Okusawa, T. Radermacher, T. Sekiguchi, T. Towstego, T. Tsukamoto, T. Vladisavljevic, T.V. Ngoc, T. Wachala, T. Yano, T. Zhu, U. Yevarouskaya, V. Berardi, V. Glagolev, V. 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