When was the first neutrino detected?

The first neutrino detection was announced in 1956 by Clyde Cowan and Frederick Reines. They observed evidence from a nuclear reactor, where electron antineutrinos were produced in huge numbers. Because neutrinos interact so weakly, they are extremely hard to detect, which made the experiment a landmark in particle physics. Reines later received the Nobel Prize in Physics for the work, while Cowan had already died before the award.