The Karlsruhe Tritium Neutrino (KATRIN) experiment in Germany has made a major advance in particle physics as of April 2025. Neutrinos are neutral subatomic particles formed in radioactive decay and nuclear reactions like those in the sun and stars. The KATRIN (Karlsruhe Tritium Neutrino) experiment, located in Karlsruhe, Germany, aims to measure the mass of the electron antineutrino, which is produced during beta decay. The latest results from KATRIN have reduced the upper limit of neutrino mass to less than 0.45 electron volts, marking a 50% improvement.
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