The neutrino is a very difficult particle to catch. It can easily pass through matter in the universe without being charged, leaving almost no trace. Hundreds of billions of neutrinos pass through the human body every second, but a person can never feel them. The best way to find neutrinos is to use a detector such as the "Supergods".
Neutrinos are fast and small, but they leave a faint trail when they pass through pure water. This phenomenon, known as Cherenkov radiation, is the trick to finding neutrinos. The purer the water, the more pronounced this radiation is. That's why Japan hides its water in a mine nearly 1,000 meters deep.
The 50,000 tons of pure water is actually relatively competitive. The U.S. Kamioka Probe and Neutrino Probe received neutrinos from the 1987A nova outburst, the first time neutrinos were detected outside the solar system.In the 1990s, $100 million was invested in upgrading Kamiokande to a "Super Kamiokande". At this time, 50,000 tons of pure water was added. Japanese scientist Masatoshi Koshiba confirmed the phenomenon of neutrino oscillations for the first time on Super Kamioka, and obtained the discovery in 2002
Neutrinos are known as the invisible man of the universe. Because they are not electrically charged, they do not interact electromagnetically with matter. This has led to neutrinos being able to easily penetrate the Earth.
Of course neutrinos can easily penetrate water, so why do you need pure water to detect neutrinos?
This is because neutrinos penetrating pure water leave a trail, known as Cherenkov radiation. It leaves a blue glow.
The larger the volume of pure water, the more pronounced the Cherenkov radiation. It's easier to study neutrino laws.
Japan's kamikaze detector is in a mine 1,000 meters deep.
Its equipment is 41 meters high and 39 meters long. It could theoretically be filled with 50,000 tons of pure water. It studies only the neutrino and proton decay effects emitted by the sun.
The sun, the earth, nuclear reactors, supernova outbursts, the big bang at the birth of the universe, etc. all produce large numbers of neutrinos. They travel at close to the speed of light. According to physical theory, 1,000 trillion cosmic neutrinos pass through a person's body every second. Because neutrinos almost do not react with matter, the probability of reaction is very small, so you need to build a huge detector to "catch" it, "super god gang" is born in this context.
China has Jiangmen neutrino experiment with 20,000 tons of liquid scintillation detector, built in Jiangmen City, Guangdong Province, Kaiping City, Dashishan, Jinji Town, Chishui Town. Dashishan is only 53 kilometers from the Yangjiang and Taishan reactors, which meets the requirement of being about 60 kilometers from the reactors, where the neutrinos coming out of the reactors have the most pronounced oscillatory effect.