Water Cerenkov detector

A Water Cherenkov detector is a scientific instrument used to observe high-energy particles, such as cosmic rays or neutrinos. It consists of a large tank filled with ultra-pure water and sensitive light detectors called photomultiplier tubes. When a charged particle travels faster than light does in water, it emits a faint blue light known as Cherenkov radiation. The photomultiplier tubes detect this light, allowing scientists to analyze the particle's properties and origins. This method provides valuable insights into fundamental particles and the universe's most energetic phenomena.