KATRIN
Experiment for measuring antineutrino mass / From Wikipedia, the free encyclopedia
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KATRIN is a German acronym (Karlsruhe Tritium Neutrino Experiment) for an undertaking to measure the mass of the electron antineutrino with sub-eV precision by examining the spectrum of electrons emitted from the beta decay of tritium. The experiment is a recognized CERN experiment (RE14).[1][2] The core of the apparatus is a 200-ton spectrometer.
In 2015, the commissioning measurements on this spectrometer were completed, successfully verifying its basic vacuum, transmission and background properties.[3] The experiment began running tests in October 2016. The inauguration took place 11 June 2018, with the first tritium measurements by the experiment (the so-called First Tritium or FT 2-week engineering run in mid-2018). The projected experiment duration at the time was 5 years. The first science measurements (so-called first campaign) took place 10 April 2019.[4]
In February 2022, the experiment announced an upper limit of mν < 0.8 eV c–2 at 90% confidence level.[5][6]