How Physicists Track and Trap the Elusive Neutrino

Seventy years ago, the physicists Clyde Cowan and Frederick Reines took a custom-built 10-ton detector, surrounded it with thick lead walls and wet sandbags, and placed it near a powerful nuclear reactor at the Savannah River Plant in South Carolina. They called the experiment “Project Poltergeist,” designed as it was to catch a ghost. More than a quarter of a century before… Source