Study of the neutrino mass hierarchy with the atmospheric neutrino data collected in Super-Kamiokande IV

Mar 12, 2019
241 pages
Thesis: PhD
  • Kyoto U.
(Mar, 2019)
  • Published: Mar 12, 2019
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Abstract: (submitter)
Super-Kamiokande (SK) is a large underground water Cherenkov detector located in the Kamioka mine in Mt. Ikenoyama, Gifu Prefecture, Japan. The detector consists of a water tank holding 50 kt of ultra-pure water, and more than 11,000 photomultiplier tubes (PMT) for the Cherenkov light’s detection. A new algorithm, named fiTQun, employs a maximum likelihood method using the charge and time information that is observed by the PMTs to reconstruct particle types and their kinematics in the detector. Comparing with the conventional reconstruction algorithm, fiTQun shows better performance. An analysis of the neutrino mass hierarchy with the atmospheric neutrino data reconstructed by fiTQun in SK-IV with a livetime of 3118.5 days is presented in this thesis. Due to the improved performance of fiTQun, the fiducial volume (FV) is expanded from 22.5 kt to 29.7 kt by changing the FV cut from D wall 1 > 200 cm to D wall > 50cm which provides higher statistics in this analysis.
  • Neutrino oscillation
  • Atmospheric neutrino
  • Neutrino mass hierarchy
  • Super-Kamiokande