Neutron tagging following atmospheric neutrino events in a water Cherenkov detector

We present the development of neutron-tagging techniques in Super-Kamiokande IV using a neural network analysis. The detection efficiency of neutron capture on hydrogen is estimated to be 26%, with a mis-tag rate of 0.016 per neutrino event. The uncertainty of the tagging efficiency is estimated to...

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Hauptverfasser:	Haga, Y, Hayato, Y, Ikeda, M, Imaizumi, S, Kameda, J, Kataoka, Y, Mochizuki, T, Nakajima, T, Nakano, Y, Okada, T, Okamoto, K, Takenaka, A, Tasaka, S, Tomura, T, Watanabe, S, Kajita, T, Lee, K. P, McLachlan, T, Tashiro, T, Blaszczyk, F. D. M, Kachulis, C, Sussman, S, Wester, T, Pointon, B. W, Bian, J, Carminati, G, Griskevich, N. J, Kropp, W. R, Takhistov, V, Hartfiel, B. L, Hill, J, Hong, N, Lim, I. T, Li, Z, O'Sullivan, Erin, Walter, C. W, Bernard, L, El Hedri, S, Giampaolo, A, Mueller, Th A, Ishizuka, T, Jang, J. S, Litchfield, R. P, Ma, W. Y, Uchida, Y, Wascko, M. O, Berardi, V, Intonti, R. A, Collazuol, G, Lamoureux, M, Ishida, T, Matsubara, T, Sekiguchi, T, Tsukamoto, T, Migenda, J, Abe, K. E, Hasegawa, M, Isobe, Y, Miyabe, H, Shiozawa, T, Yamamoto, S, Hayashino, T, Hiraki, T, Jiang, M, Nakamura, Ke, Nakaya, T, Suzuki, K, Takahashi, S, McCauley, N, Tsui, K. M, Mitsuka, G, Niwa, T, Mijakowski, P, Hignight, J, Palomino, J. L, Ito, S, Kayano, T, Barrow, D, Nova, F, Jenkins, S. J, Malek, M, Stone, O, Okazawa, H, Choi, Y, Ichikawa, A. K, Ito, K, Totsuka, Y, Nakajima, Y, Ogawa, N, Yokoyama, M, Izumiyama, S, Ito, H, Shinoki, M, Martin, J. F, Nantais, C. M, Chen, S, Berkman, S, Wilkes, R. J, Walker, J, Sano, S
Format:	Artikel
Sprache:	eng
Schlagworte:	Accelerator Physics and Instrumentation Acceleratorfysik och instrumentering Cherenkov detectors Large detector systems for particle and astroparticle physics Neutrino detectors Particle identification methods Subatomic Physics Subatomär fysik
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Zusammenfassung:	We present the development of neutron-tagging techniques in Super-Kamiokande IV using a neural network analysis. The detection efficiency of neutron capture on hydrogen is estimated to be 26%, with a mis-tag rate of 0.016 per neutrino event. The uncertainty of the tagging efficiency is estimated to be 9.0%. Measurement of the tagging efficiency with data from an Americium-Beryllium calibration agrees with this value within 10%. The tagging procedure was performed on 3,244.4 days of SK-IV atmospheric neutrino data, identifying 18,091 neutrons in 26,473 neutrino events. The fitted neutron capture lifetime was measured as 218 +/- 9 mu s.
DOI:	10.1088/1748-0221/17/10/P10029