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  1. Book ; Online: First Gadolinium Loading to Super-Kamiokande

    Abe, K. / Bronner, C. / Hayato, Y. / Hiraide, K. / Ikeda, M. / Imaizumi, S. / Kameda, J. / Kanemura, Y. / Kataoka, Y. / Miki, S. / Miura, M. / Moriyama, S. / Nagao, Y. / Nakahata, M. / Nakayama, S. / Okada, T. / Okamoto, K. / Orii, A. / Pronost, G. /
    Sekiya, H. / Shiozawa, M. / Sonoda, Y. / Suzuki, Y. / Takeda, A. / Takemoto, Y. / Takenaka, A. / Tanaka, H. / Watanabe, S. / Yano, T. / Han, S. / Kajita, T. / Okumura, K. / Tashiro, T. / Xia, J. / Megias, G. D. / Bravo-Berguno, D. / Labarga, L. / Marti, Ll. / Zaldivar, B. / Pointon, B. W. / Blaszczyk, F. d. M. / Kearns, E. / Raaf, J. L. / Stone, J. L. / Wan, L. / Wester, T. / Bian, J. / Griskevich, N. J. / Kropp, W. R. / Locke, S. / Mine, S. / Smy, M. B. / Sobel, H. W. / Takhistov, V. / Hill, J. / Kim, J. Y. / Lim, I. T. / Park, R. G. / Bodur, B. / Scholberg, K. / Walter, C. W. / Bernard, L. / Coffani, A. / Drapier, O. / Hedri, S. El / Giampaolo, A. / Gonin, M. / Mueller, Th. A. / Paganini, P. / Quilain, B. / Ishizuka, T. / Nakamura, T. / Jang, J. S. / Learned, J. G. / Anthony, L. H. V. / Martin, D. / Scott, M. / Sztuc, A. A. / Uchida, Y. / Cao, S. / Berardi, V. / Catanesi, M. G. / Radicioni, E. / Calabria, N. F. / Machado, L. N. / De Rosa, G. / Collazuol, G. / Iacob, F. / Lamoureux, M. / Mattiazzi, M. / Ospina, N. / Ludovici, L. / Maekawa, Y. / Nishimura, Y. / Friend, M. / Hasegawa, T. / Ishida, T. / Kobayashi, T. / Jakkapu, M. / Matsubara, T. / Nakadaira, T. / Nakamura, K. / Oyama, Y. / Sakashita, K. / Sekiguchi, T. / Tsukamoto, T. / Boschi, T. / Gao, J. / Di Lodovico, F. / Migenda, J. / Taani, M. / Zsoldos, S. / Kotsar, Y. / Nakano, Y. / Ozaki, H. / Shiozawa, T. / Suzuki, A. T. / Takeuchi, Y. / Yamamoto, S. / Ali, A. / Ashida, Y. / Feng, J. / Hirota, S. / Kikawa, T. / Mori, M. / Nakaya, T. / Wendell, R. A. / Yasutome, K. / Fernandez, P. / McCauley, N. / Mehta, P. / Tsui, K. M. / Fukuda, Y. / Itow, Y. / Menjo, H. / Niwa, T. / Sato, K. / Tsukada, M. / Lagoda, J. / Lakshmi, S. M. / Mijakowski, P. / Zalipska, J. / Jiang, J. / Jung, C. K. / Vilela, C. / Wilking, M. J. / Yanagisawa, C. / Hagiwara, K. / Harada, M. / Horai, T. / Ishino, H. / Ito, S. / Kitagawa, F. / Koshio, Y. / Ma, W. / Piplani, N. / Sakai, S. / Barr, G. / Barrow, D. / Cook, L. / Goldsack, A. / Samani, S. / Wark, D. / Nova, F. / Yang, J. Y. / Jenkins, S. J. / Malek, M. / McElwee, J. M. / Stone, O. / Thiesse, M. D. / Thompson, L. F. / Okazawa, H. / Kim, S. B. / Seo, J. W. / Yu, I. / Ichikawa, A. K. / Nishijima, K. / Koshiba, M. / Iwamoto, K. / Nakajima, Y. / Ogawa, N. / Yokoyama, M. / Martens, K. / Vagins, M. R. / Kuze, M. / Izumiyama, S. / Yoshida, T. / Inomoto, M. / Ishitsuka, M. / Ito, H. / Kinoshita, T. / Matsumoto, R. / Ohta, K. / Shinoki, M. / Suganuma, T. / Martin, J. F. / Tanaka, H. A. / Towstego, T. / Akutsu, R. / Hartz, M. / Konaka, A. / de Perio, P. / Prouse, N. W. / Chen, S. / Xu, B. D. / Posiadala-Zezula, M. / Hadley, D. / O'Flaherty, M. / Richards, B. / Jamieson, B. / Walker, J. / Minamino, A. / Pintaudi, G. / Sano, S. / Sasaki, R.

    2021  

    Abstract: In order to improve Super-Kamiokande's neutron detection efficiency and to thereby increase its sensitivity to the diffuse supernova neutrino background flux, 13 tons of Gd2(SO4)3*8H2O(gadolinium sulfate octahydrate) was dissolved into the detector's ... ...

    Abstract In order to improve Super-Kamiokande's neutron detection efficiency and to thereby increase its sensitivity to the diffuse supernova neutrino background flux, 13 tons of Gd2(SO4)3*8H2O(gadolinium sulfate octahydrate) was dissolved into the detector's otherwise ultrapure water from July 14 to August 17, 2020, marking the start of the SK-Gd phase of operations. During the loading, water was continuously recirculated at a rate of 60 m3/h, extracting water from the top of the detector and mixing it with concentrated Gd2(SO4)3*8H2O solution to create a 0.02% solution of the Gd compound before injecting it into the bottom of the detector. A clear boundary between the Gd-loaded and pure water was maintained through the loading, enabling monitoring of the loading itself and the spatial uniformity of the Gd concentration over the 35 days it took to reach the top of the detector.During the subsequent commissioning the recirculation rate was increased to 120 m3/h, resulting in a constant and uniform distribution of Gd throughout the detector and water transparency equivalent to that of previous pure-water operation periods. Using an Am-Be neutron calibration source the mean neutron capture time was measured to be $115.6\pm0.6$ $\mu$s, which corresponds to a Gd concentration of $110.9\pm1.4$ (stat.only) ppm, as expected for this level of doping. This paper describes changes made to the water circulation system for this detector upgrade, the Gd loading procedure, detector commissioning, and the first neutron calibration measurements in SK-Gd.

    Comment: 37 pages, 19 Figures, Submitted to Nucl. Instrum. Meth. A
    Keywords Physics - Instrumentation and Detectors ; Astrophysics - Instrumentation and Methods for Astrophysics
    Subject code 551
    Publishing date 2021-09-01
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Search for Electron Antineutrino Appearance in a Long-Baseline Muon Antineutrino Beam.

    Abe, K / Akutsu, R / Ali, A / Alt, C / Andreopoulos, C / Anthony, L / Antonova, M / Aoki, S / Ariga, A / Asada, Y / Ashida, Y / Atkin, E T / Awataguchi, Y / Ban, S / Barbi, M / Barker, G J / Barr, G / Barrow, D / Barry, C /
    Batkiewicz-Kwasniak, M / Beloshapkin, A / Bench, F / Berardi, V / Berkman, S / Berns, L / Bhadra, S / Bienstock, S / Blondel, A / Bolognesi, S / Bourguille, B / Boyd, S B / Brailsford, D / Bravar, A / Bravo Berguño, D / Bronner, C / Bubak, A / Buizza Avanzini, M / Calcutt, J / Campbell, T / Cao, S / Cartwright, S L / Catanesi, M G / Cervera, A / Chappell, A / Checchia, C / Cherdack, D / Chikuma, N / Christodoulou, G / Coleman, J / Collazuol, G / Cook, L / Coplowe, D / Cudd, A / Dabrowska, A / De Rosa, G / Dealtry, T / Denner, P F / Dennis, S R / Densham, C / Di Lodovico, F / Dokania, N / Dolan, S / Doyle, T A / Drapier, O / Dumarchez, J / Dunne, P / Eklund, L / Emery-Schrenk, S / Ereditato, A / Fernandez, P / Feusels, T / Finch, A J / Fiorentini, G A / Fiorillo, G / Francois, C / Friend, M / Fujii, Y / Fujita, R / Fukuda, D / Fukuda, R / Fukuda, Y / Fusshoeller, K / Gameil, K / Giganti, C / Golan, T / Gonin, M / Gorin, A / Guigue, M / Hadley, D R / Haigh, J T / Hamacher-Baumann, P / Hartz, M / Hasegawa, T / Hastings, N C / Hayashino, T / Hayato, Y / Hiramoto, A / Hogan, M / Holeczek, J / Hong Van, N T / Iacob, F / Ichikawa, A K / Ikeda, M / Ishida, T / Ishii, T / Ishitsuka, M / Iwamoto, K / Izmaylov, A / Jakkapu, M / Jamieson, B / Jenkins, S J / Jesús-Valls, C / Jiang, M / Johnson, S / Jonsson, P / Jung, C K / Kabirnezhad, M / Kaboth, A C / Kajita, T / Kakuno, H / Kameda, J / Karlen, D / Kasetti, S P / Kataoka, Y / Katori, T / Kato, Y / Kearns, E / Khabibullin, M / Khotjantsev, A / Kikawa, T / Kim, H / Kim, J / King, S / Kisiel, J / Knight, A / Knox, A / Kobayashi, T / Koch, L / Koga, T / Konaka, A / Kormos, L L / Koshio, Y / Kostin, A / Kowalik, K / Kubo, H / Kudenko, Y / Kukita, N / Kuribayashi, S / Kurjata, R / Kutter, T / Kuze, M / Labarga, L / Lagoda, J / Lamoureux, M / Laveder, M / Lawe, M / Licciardi, M / Lindner, T / Litchfield, R P / Liu, S L / Li, X / Longhin, A / Ludovici, L / Lu, X / Lux, T / Machado, L N / Magaletti, L / Mahn, K / Malek, M / Manly, S / Maret, L / Marino, A D / Marti-Magro, L / Martin, J F / Maruyama, T / Matsubara, T / Matsushita, K / Matveev, V / Mavrokoridis, K / Mazzucato, E / McCarthy, M / McCauley, N / McFarland, K S / McGrew, C / Mefodiev, A / Metelko, C / Mezzetto, M / Minamino, A / Mineev, O / Mine, S / Miura, M / Molina Bueno, L / Moriyama, S / Morrison, J / Mueller, Th A / Munteanu, L / Murphy, S / Nagai, Y / Nakadaira, T / Nakahata, M / Nakajima, Y / Nakamura, A / Nakamura, K G / Nakamura, K / Nakayama, S / Nakaya, T / Nakayoshi, K / Nantais, C / Ngoc, T V / Niewczas, K / Nishikawa, K / Nishimura, Y / Nonnenmacher, T S / Nova, F / Novella, P / Nowak, J / Nugent, J C / O'Keeffe, H M / O'Sullivan, L / Odagawa, T / Okumura, K / Okusawa, T / Oser, S M / Owen, R A / Oyama, Y / Palladino, V / Palomino, J L / Paolone, V / Parker, W C / Pasternak, J / Paudyal, P / Pavin, M / Payne, D / Penn, G C / Pickering, L / Pidcott, C / Pintaudi, G / Pinzon Guerra, E S / Pistillo, C / Popov, B / Porwit, K / Posiadala-Zezula, M / Pritchard, A / Quilain, B / Radermacher, T / Radicioni, E / Radics, B / Ratoff, P N / Reinherz-Aronis, E / Riccio, C / Rondio, E / Roth, S / Rubbia, A / Ruggeri, A C / Ruggles, C A / Rychter, A / Sakashita, K / Sánchez, F / Schloesser, C M / Scholberg, K / Schwehr, J / Scott, M / Seiya, Y / Sekiguchi, T / Sekiya, H / Sgalaberna, D / Shah, R / Shaikhiev, A / Shaker, F / Shaykina, A / Shiozawa, M / Shorrock, W / Shvartsman, A / Smirnov, A / Smy, M / Sobczyk, J T / Sobel, H / Soler, F J P / Sonoda, Y / Steinmann, J / Suvorov, S / Suzuki, A / Suzuki, S Y / Suzuki, Y / Sztuc, A A / Tada, M / Tajima, M / Takeda, A / Takeuchi, Y / Tanaka, H K / Tanaka, H A / Tanaka, S / Thompson, L F / Toki, W / Touramanis, C / Towstego, T / Tsui, K M / Tsukamoto, T / Tzanov, M / Uchida, Y / Uno, W / Vagins, M / Valder, S / Vallari, Z / Vargas, D / Vasseur, G / Vilela, C / Vinning, W G S / Vladisavljevic, T / Volkov, V V / Wachala, T / Walker, J / Walsh, J G / Wang, Y / Wark, D / Wascko, M O / Weber, A / Wendell, R / Wilking, M J / Wilkinson, C / Wilson, J R / Wilson, R J / Wood, K / Wret, C / Yamada, Y / Yamamoto, K / Yanagisawa, C / Yang, G / Yano, T / Yasutome, K / Yen, S / Yershov, N / Yokoyama, M / Yoshida, T / Yu, M / Zalewska, A / Zalipska, J / Zaremba, K / Zarnecki, G / Ziembicki, M / Zimmerman, E D / Zito, M / Zsoldos, S / Zykova, A

    Physical review letters

    2020  Volume 124, Issue 16, Page(s) 161802

    Abstract: Electron antineutrino appearance is measured by the T2K experiment in an accelerator-produced antineutrino beam, using additional neutrino beam operation to constrain parameters of the Pontecorvo-Maki-Nakagawa-Sakata (PMNS) mixing matrix. T2K observes 15 ...

    Abstract Electron antineutrino appearance is measured by the T2K experiment in an accelerator-produced antineutrino beam, using additional neutrino beam operation to constrain parameters of the Pontecorvo-Maki-Nakagawa-Sakata (PMNS) mixing matrix. T2K observes 15 candidate electron antineutrino events with a background expectation of 9.3 events. Including information from the kinematic distribution of observed events, the hypothesis of no electron antineutrino appearance is disfavored with a significance of 2.40σ and no discrepancy between data and PMNS predictions is found. A complementary analysis that introduces an additional free parameter which allows non-PMNS values of electron neutrino and antineutrino appearance also finds no discrepancy between data and PMNS predictions.
    Language English
    Publishing date 2020-05-08
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.124.161802
    Database MEDical Literature Analysis and Retrieval System OnLINE

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