Oleg Zabluda's blog
Friday, September 14, 2018
 
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Karlsruhe Tritium Neutrino (KATRIN) experiment
[...]
In 1949, a first study concluded that the neutrino weighed less than 500 eV. Since then, successive experiments have cut the upper limit in half roughly every 8 years [...] The upper limit now stands at about 2 eV—two-billionths the mass of the lightest atom—as experimenters in Mainz, Germany, and Troitsk, Russia, independently reported in 1999.

In 2001, those teams and others gathered in a castle high on a hill in the hamlet of Bad Liebenzell in Germany's Black Forest and decided to push further, by mounting the definitive tritium beta decay experiment.[...] KATRIN experimenters hope to lower the mass limit by a factor of 10, to 0.2 eV—or, better yet, to come up with an actual measurement of the neutrino mass.
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http://www.sciencemag.org/news/2017/06/weighing-universes-most-elusive-particle
http://www.sciencemag.org/news/2017/06/weighing-universes-most-elusive-particle

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