Decades of Neutrino Detection Reveal Secrets of the Universe

Seventy years ago, physicists Clyde Cowan and Frederick Reines set out to detect neutrinos, particles proposed by Wolfgang Pauli in 1930 as a solution to the missing energy during beta decay. In early 1956, they deployed a massive detector near a nuclear reactor at the Savannah River Plant in South Carolina and successfully detected neutrinos. Since then, various experiments have been conducted to study these elusive particles, including Project Poltergeist, Raymond Davis Jr.'s experiment at Brookhaven National Laboratory, and Masatoshi Koshiba's Kamiokande detector in Japan. These experiments led to the discovery of neutrino oscillations, a phenomenon that reveals neutrinos have mass and can switch between different 'flavors'. Newer detectors like IceCube Neutrino Observatory, Cubic Kilometer Neutrino Telescope (KM3NET), China's Jiangmen Underground Neutrino Observatory (JUNO), Japan’s Hyper-Kamiokande, and the Deep Underground Neutrino Experiment (DUNE) continue to uncover mysteries about neutrinos and their role in the universe.