Transport of the main spectrometer to the Karlsruhe Institute of Technology.
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]
^"Recognized Experiments at CERN". The CERN Scientific Committees. CERN. Archived from the original on 13 June 2019. Retrieved 20 January 2020.
^"RE14/KATRIN : The Karlsruhe Tritium Neutrino experiment". The CERN Experimental Programme. CERN. Retrieved 20 January 2020.
^Mertens, S.; et al. (KATRIN Collaboration) (2015). "Status of the KATRIN Experiment and Prospects to Search for keV-mass Sterile Neutrinos in Tritium β-decay". Physics Procedia. 62: 267–273. Bibcode:2015PhPro..61..267M. doi:10.1016/j.phpro.2014.12.043.
^The KATRIN Collaboration. "Direct neutrino-mass measurement with sub-electronvolt sensitivity", Nat. Phys.18, 160–166 (2022). doi:10.1038/s41567-021-01463-1
^Castelvecchi, Davide (14 February 2022). "How light is a neutrino? The answer is closer than ever". Nature. doi:10.1038/d41586-022-00430-x. PMID 35165410. S2CID 246827702.
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