NEMO closes in on neutrino mass

The NEMO (Neutrino Ettore Majorana Observatory) experiment, whose goal was to elucidate the nature of neutrinos and measure their mass, yielded very positive results. The product of an extensive international collaboration including seven CNRS joint laboratories1, the detector, installed in the Modane Underground Laboratory (CNRS/CEA) in the Fréjus road tunnel, ran from 2003 to 2011. The observation, in seven different isotopes, of an extremely rare radioactive decay event, the so-called ‘allowed’ double-beta decay, helped improve our understanding of the atomic nucleus. In addition, the data collected during the search for the so-called ‘forbidden’ double-beta decay enabled the researchers to establish a range (0.3-0.9 eV) for the upper limit on the mass of the neutrino.

from Physics News

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