First study of neutron tagging with a water Cherenkov detector

H. Watanabe, H. Zhang, K. Abe, Y. Hayato, T. Iida, M. Ikeda, J. Kameda, K. Kobayashi, Y. Koshio, M. Miura, S. Moriyama, M. Nakahata, S. Nakayama, Y. Obayashi, H. Ogawa, H. Sekiya, M. Shiozawa, Y. Suzuki, A. Takeda, Y. TakenagaY. Takeuchi, K. Ueno, K. Ueshima, S. Yamada, S. Hazama, I. Higuchi, C. Ishihara, T. Kajita, K. Kaneyuki, G. Mitsuka, H. Nishino, K. Okumura, N. Tanimoto, S. Clark, S. Desai, F. Dufour, E. Kearns, S. Likhoded, M. Litos, J. Raaf, J. L. Stone, L. R. Sulak, W. Wang, M. Goldhaber, K. Bays, D. Casper, J. P. Cravens, J. Dunmore, J. Griskevich, W. R. Kropp, D. W. Liu, S. Mine, C. Regis, M. B. Smy, H. W. Sobel, K. S. Ganezer, J. Hill, W. E. Keig, J. S. Jang, I. S. Jeong, J. Y. Kim, I. T. Lim, M. Fechner, K. Scholberg, C. W. Walter, R. Wendel, S. Tasaka, G. Guillian, J. G. Learned, S. Matsuno, M. D. Messier, Y. Watanabe, T. Hasegawa, T. Ishida, T. Ishii, T. Kobayashi, T. Nakadaira, K. Nakamura, K. Nishikawa, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, A. T. Suzuki, A. K. Ichikawa, A. Minamino, T. Nakaya, M. Yokoyama, T. J. Haines, S. Dazeley, R. Svoboda, R. Gran, A. Habig, Y. Fukuda, Y. Itow, T. Tanaka, C. K. Jung, C. McGrew, A. Sarrat, R. Terri, C. Yanagisawa, N. Tamura, Y. Idehara, H. Ishino, A. Kibayashi, M. Sakuda, Y. Kuno, M. Yoshida, S. B. Kim, B. S. Yang, T. Ishizuka, H. Okazawa, Y. Choi, H. K. Seo, Y. Furuse, K. Nishijima, Y. Yokosawa, M. Koshiba, Y. Totsuka, M. R. Vagins, S. Chen, Z. Deng, G. Gong, Y. Liu, T. Xue, D. Kielczewska, H. G. Berns, K. K. Shiraishi, E. Thrane, R. J. Wilkes

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Abstract

A first study of neutron tagging is conducted in Super-Kamiokande, a 50,000 ton water Cherenkov detector. The tagging efficiencies of thermal neutrons are evaluated in a 0.2% GdCl3-water solution and pure water. They are determined to be, respectively, 66.7% for events above 3 MeV and 20% with corresponding background probabilities of 2 × 10- 4 and 3 × 10- 2. This newly developed technique may enable water Cherenkov detectors to identify over(ν, ̄)e's from astrophysical sources as well as those produced by commercial reactors via the delayed coincidence scheme.

Original languageEnglish
Pages (from-to)320-328
Number of pages9
JournalAstroparticle Physics
Volume31
Issue number4
DOIs
Publication statusPublished - May 2009

Keywords

  • Gadolinium
  • Neutron tagging
  • Water Cherenkov detector

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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  • Cite this

    Watanabe, H., Zhang, H., Abe, K., Hayato, Y., Iida, T., Ikeda, M., Kameda, J., Kobayashi, K., Koshio, Y., Miura, M., Moriyama, S., Nakahata, M., Nakayama, S., Obayashi, Y., Ogawa, H., Sekiya, H., Shiozawa, M., Suzuki, Y., Takeda, A., ... Wilkes, R. J. (2009). First study of neutron tagging with a water Cherenkov detector. Astroparticle Physics, 31(4), 320-328. https://doi.org/10.1016/j.astropartphys.2009.03.002