Neutrinoless double beta decay
= Neutrinoless double beta decay
{title2=$(A,Z)\to(A,Z+2)+2e^-$}
= Zero-neutrino double beta decay
{synonym}
A lepton-number-violating nuclear transformation emitting two electrons without <neutrinos>. A signal appears near the nuclear <Q value> in summed electron <energy>, after recoil and detector response are accounted for. Its interpretation requires the decay mechanism and nuclear <matrix elements>.