Neutron Tagging following Atmospheric Neutrino Events in a Water Cherenkov Detector

Abstract

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 \pm 9 μs.

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• Atmospheric neutrino oscillation analysis with neutron tagging and an expanded fiducial volume in Super-Kamiokande I-V
• Nuclear deexcitation simulator for neutrino interactions and nucleon decays of ${}^{12}\text{C}$ and ${}^{16}\text{O}$ based on TALYS
• Measurement of neutron production in atmospheric neutrino interactions at Super-Kamiokande
• Benchmarks and applications of the nuclear deexcitation event generator NucDeEx
• Neutron multiplicity measurement in muon capture on oxygen nuclei in the Gd-loaded Super-Kamiokande detector