Collaboration Researches

Super-Kamiokande [HP] SK


Super-Kamiokande is a 50,000 ton water Cherenkov detector and primarily observes the elementary particles known as neutrinos. Super-Kamiokande started observation in 1996 after 5 year of construction. The detector is used in cooperation with about 100 researchers from 30 collaborating institutes in Japan, US, Korea, China, Poland and Spain.

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XMASSIt is known that there are a large amount of unknown matter in the Universe, more than 5 or 6 times well-known matter such as atoms or molecules. They are called as dark matter since their nature is unknown. The XMASS experiment utilizes liquid xenon (-100C) for direct detection of dark matter.

Since dark matter is supposed to be the origin of the large structure in the Universe, direct detection of dark matter reveals its crucial role in the history of the Universe.

Furthermore, direct detection of dark matter leads to discovery of new particles.

At present we are takind data using the phase-I detector (the world largest detector using 835kg of liquid xenon) after we improved its background and planning to build more sensitive detectors in future.

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Gravitational Wave group [HP]

Gravity group

The gravitational wave group is now challenging the direct detection of gravitational waves from the generation of black holes and so on, taking the advantage of the low seismic noise environment underground. After the technical demonstration in the cryogenic laser interferometer observatory (CLIO) with 100-m baseline, KAGRA gravitational wave telescope with 3-km baseline is now under construction. At the same time, a laser strainmeter and a superconductive gravity meter are operated underground to detect tiny vibration of the Earth for the research of geophysics and geodesy.




“NEWAGE”, run by Kobe university, is one of the next generation dark matter search experiments in the world. NEWAGE aims to detect the dark matter as the wind blowing on the earth. The solar system, where we are, is traveling through our galaxy, and we feel the dark matter wind on the earth.

We have started preliminary measurements with a small-sized detector. A large-sized detector shall bring us another new discovery of the dark matter wind detection from the Kamioka mine in a near future.




The character of the neutrinos is thought to be one of the most important key to solve the mystery why the universe is mostly made of ordinary matter with little or no antimatter.

In order to verify whether neutrinos are Majorana particles that allow particle to anti-particle transition, we are studying the double beta decay of calcium-48 by CANDLES detector system which employs a large amount of calcium fluoride crystals.

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