Neutrinos are much lighter than the other constituents of matter. One explanation for this could be that neutrinos are their own antiparticles and belong to a new class of 'Majorana' particle. An experiment sets strong constraints on this scenario.
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Gratta, G. Search for neutrinoless double-β decay. Nature 538, 48–49 (2016). https://doi.org/10.1038/nature19473
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DOI: https://doi.org/10.1038/nature19473
