Keynote Talk: 'From Kamiokande to Hyper-Kamiokande' (International Conference on Neutrino Physics, 2015)

Summary

Masatoshi Koshiba's keynote address at the 2015 International Conference on Neutrino Physics outlines the scientific journey and future ambitions of neutrino detection, focusing on the evolution from the Kamiokande experiment to the proposed Hyper-Kamiokande. The central thesis is that the advancement of neutrino physics, particularly in understanding neutrino oscillations and their implications for fundamental physics, is directly driven by the development of increasingly sensitive and capable detectors. Koshiba emphasizes the historical significance of Kamiokande's discoveries, such as the solar neutrino anomaly and atmospheric neutrino deficit, which provided crucial evidence for neutrino mass and oscillations, thereby challenging the Standard Model of particle physics.

The address details the technical innovations and scale-up required for Hyper-Kamiokande, a next-generation water Cherenkov detector. Readers gain insight into the scientific questions that Hyper-Kamiokande aims to address, including the precise measurement of neutrino oscillation parameters, the search for CP violation in the lepton sector, and potential detection of proton decay and astrophysical neutrinos. The takeaway is the ongoing pursuit of fundamental physics knowledge through large-scale, international scientific collaboration and technological innovation in neutrino detection.

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Key concepts

• Kamiokande — An early, large-scale water Cherenkov detector that made seminal discoveries in neutrino physics.
• Hyper-Kamiokande — A proposed next-generation, significantly larger water Cherenkov detector designed for enhanced neutrino oscillation and other physics measurements.
• Neutrino Oscillations — The phenomenon where neutrinos change their "flavor" (electron, muon, or tau) as they travel, providing evidence for non-zero neutrino mass.
• Solar Neutrino Anomaly — The observed deficit of electron neutrinos from the Sun, later explained by neutrino oscillations.
• Atmospheric Neutrino Deficit — The imbalance in the ratio of muon to electron neutrinos detected from cosmic ray interactions in the atmosphere, also explained by neutrino oscillations.
• CP Violation in the Lepton Sector — The hypothetical difference in the behavior of neutrinos and antineutrinos during oscillations, which could explain the matter-antimatter asymmetry in the universe.