The quest to identify the nature of the neutrino’s alter ego is heating up

Physicists are trying to see if the particle’s matter and antimatter versions are the same

ANTIMATTER MYSTERY  Physicists suspect that the neutrino may be its own antiparticle. Experiments such as GERDA (shown) are attempting to determine whether that hunch is correct by searching for a rare type of nuclear decay.

K. Freund/GERDA collaboration

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