Neutron tagging following atmospheric neutrino events in a water Cherenkov detector


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2 Citations (Scopus)


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 μs.

Original languageEnglish
Article numberP10029
JournalJournal of Instrumentation
Issue number10
Publication statusPublished - Oct 1 2022


  • Cherenkov detectors
  • Large detector systems for particle and astroparticle physics
  • Neutrino detectors
  • Particle identification methods

ASJC Scopus subject areas

  • Instrumentation
  • Mathematical Physics


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