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Bringing Neutrino Research to the Next Level

schematic overview of Hyper-Kamiokande After the breakthrough discovery of neutrino oscillations in the Super-Kamiokande experiment in 1998, the properties of neutrinos have been determined, one after another, and it has become necessary to update the Standard Model.

In 2011, the T2K experiment, which used a neutrino beam from the high intensity accelerator J-PARC and the Super-Kamiokande detector, confirmed the third neutrino oscillation. Now that all neutrino oscillation modes have been confirmed, the field of neutrino research has opened up for further investigations and discoveries.

Based on the highly sensitive techniques for neutrino observation cultivated over the years, Hyper-Kamiokande represents a further improvement in sensitivity. Hyper-Kamiokande consists of a cylindrical tank, with a water depth of 71m and a diameter of 68m. The fiducial volume of tank is approximately 10 times larger than that of the Super-Kamiokande detector. On the tank wall, 40,000 ultra high sensitivity photosensors have been installed in order to detect the very weak Cherenkov light generated in the water.

Through the realization of the Hyper-Kamiokande experiment, we will lead neutrino research into the world of the future.

A Megaton Water Tank

HK tank is 20 times of SK The huge tank of Hyper-Kamiokande will be used in order to obtain an amount of data corresponding to 100 years of data collection time using Super-Kamiokande, in only 10 years. Therefore, this allows the observation of previously unrevealed rare phenomena and small CP violations.

Collaboration with the J-PARC Accelerator

T2K In addition to natural neutrinos such as atmospheric neutrinos and solar neutrinos, a high intensity and high quality neutrino beam from the J-PARC accelerator in Tokai, Ibaraki may be used for precise studies of properties such as neutrino CP violation.

Hyper-Kamiokande is expected to observe 30times as many neutrinos as the T2K experiment after the increase of the J-PARC beam power.

Experimental Technique

Experimental TechniqueThe photosensors on the tank wall detect a very weak Cherenkov light emitted by a charged particle ejected in the collision between neutrinos and water in the tank.

This Cherenkov light is emitted in the form of a cone shape along the direction of the charged particle. The energy, direction and type of neutrinos are determined using the information obtained from the photosensors, such as the quantity of light and the ring shape.

International Collaboration

In an international study center where internationally renowned researchers gather, researchers from various countries join together to aim at the realization of the Hyper-Kamiokande experiment. As of July 2020, researchers from 19 countries including Armenia, Brazil, Canada, Czech, France, Germany, India, Italy, Japan, Korea, Mexico, Poland, Russia, Spain, Sweden, Switzerland, UK, Ukraine, USA have participated in the Hyper-Kamiokande experiment.

HK Group photo