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  • First demonstration of an e...
    Yamada, K; Aoki, S; Cao, S; Chikuma, N; Fukuda, T; Fukuzawa, Y; Gonin, M; Hayashino, T; Hayato, Y; Hiramoto, A; Hosomi, F; Inoh, T; Iori, S; Ishiguro, K; Kawahara, H; Kim, H; Kitagawa, N; Koga, T; Komatani, R; Komatsu, M; Matsushita, A; Mikado, S; Minamino, A; Mizusawa, H; Matsumoto, T; Matsuo, T; Morimoto, Y; Morishima, K; Morishita, M; Naganawa, N; Nakamura, K; Nakamura, M; Nakamura, Y; Nakano, T; Nakatsuka, Y; Nakaya, T; Nishio, A; Ogawa, S; Oshima, H; Quilain, B; Rokujo, H; Sato, O; Seiya, Y; Shibuya, H; Shiraishi, T; Suzuki, Y; Tada, S; Takahashi, S; Yokoyama, M; Yoshimoto, M

    Progress of theoretical and experimental physics, 06/2017, Volume: 2017, Issue: 6
    Journal Article

    Abstract We describe the first ever implementation of a clock-based, multi-stage emulsion shifter in an accelerator neutrino experiment. The system was installed in the neutrino monitoring building at the Japan Proton Accelerator Research Complex as part of a test experiment, T60, and stable operation was maintained for a total of 126.6 days. By applying time information to emulsion films, various results were obtained. Time resolutions of 5.3–14.7 s were evaluated in an operation spanning 46.9 days (yielding division numbers of 1.4–3.8 $\times10^{5}$ ). By using timing and spatial information, reconstruction of coincident events consisting of high-multiplicity and vertex-contained events, including neutrino events, was performed. Emulsion events were matched to events observed by INGRID, one of the on-axis near detectors of the T2K experiment, with high reliability (98.5%), and hybrid analysis of the emulsion and INGRID events was established by means of the multi-stage shifter. The results demonstrate that the multi-stage shifter can feasibly be used in neutrino experiments.