Supernova Relic Neutrino search with neutron tagging at Super-Kamiokande-IV

H. Zhang, K. Abe, Y. Hayato, K. Iyogi, J. Kameda, Y. Kishimoto, M. Miura, S. Moriyama, M. Nakahata, Y. Nakano, S. Nakayama, H. Sekiya, M. Shiozawa, Y. Suzuki, A. Takeda, Y. Takenaga, T. Tomura, K. Ueno, T. Yokozawa, R. A. WendellH. Kaji, T. Kajita, K. P. Lee, Y. Nishimura, K. Okumura, T. McLachlan, L. Labarga, S. Barkman, T. S. Tanaka, S. Tobayama, E. Kearns, J. L. Raaf, J. L. Stone, L. R. Sulak, K. Bays, G. Carminati, W. R. Kropp, S. Mine, A. Renshaw, M. B. Smy, H. W. Sobel, K. S. Ganezer, J. Hill, W. E. Keig, J. S. Jang, J. Y. Kim, I. T. Lim, T. Akiri, K. Scholberg, C. W. Walter, T. Wongjirad, T. Ishizuka, S. Tasaka, J. G. Learned, S. Matsuno, S. N. Smith, 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, Y. Takeuchi, K. Ieki, M. Ikeda, H. Kikawa, K. Huang, A. Minamino, A. Murakami, T. Nakaya, K. Suzuki, S. Takahashi, Y. Fukuda, K. Choi, Y. Itow, G. Mitsuka, P. Mijakowski, J. Hignight, J. Imber, C. K. Jung, I. Taylor, C. Yanagisawa, H. Ishino, A. Kibayashi, Y. Koshio, T. Mori, M. Sakuda, R. Yamaguchi, T. Yano, Y. Kuno, R. Tacik, S. B. Kim, H. Okazawa, Y. Choi, K. Nishijima, M. Koshiba, M. Yokoyama, K. Martens, Ll Marti, M. R. Vagins, J. F. Martin, P. Deperio, A. Konaka, M. J. Wilking, S. Chen, H. Sui, Z. Yang, Y. Zhang, K. Connolly, M. Dziomba, R. J. Wilkes

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114 Scopus citations


A search for Supernova Relic Neutrinos ν̄e's is first conducted via inverse-beta-decay by tagging neutron capture on hydrogen at Super-Kamiokande-IV. The neutron tagging efficiency is determined to be (17.74±0.04stat.±1.05sys.)%, while the corresponding accidental background probability is (1.06±0.01 stat.±0.18sys.)%. Using 960 days of data, we obtain 13 inverse-beta-decay candidates in the range of Eν̄e between 13.3 MeV and 31.3 MeV. All of the observed candidates are attributed to background. Upper limits at 90% C.L. are calculated in the absence of a signal.

Original languageEnglish (US)
Pages (from-to)41-46
Number of pages6
JournalAstroparticle Physics
StatePublished - Jan 2015
Externally publishedYes

Bibliographical note

Funding Information:
The authors gratefully acknowledge the cooperation of the Kamioka Mining and Smelting Company. The Super-Kamiokande detector was built and operated with funds provided by the Japanese Ministry of Education, Culture, Sports and Technology , the United States Department of Energy , and the U.S. National Science Foundation . This work is also supported by the National Natural Science Foundation of China (Grant No. 11235006 ).


  • Hydrogen
  • Neutron tagging
  • Supernova Relic Neutrinos
  • Water Cherenkov detector


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