Physicists Just Achieved a New Smallest Measurement of a Ghost Particle’s Mass

Decaying isotopes of hydrogen have just given us the smallest measurement yet of the mass of a neutrino. By measuring the energy distribution of electrons released during the beta decay of tritium, physicists have determined that the upper limit for the mass of the electron antineutrino is just 0.8 electronvolts. That’s 1.6 × 10–36 kilograms … Read more