= Double-beta summed-electron-energy signature
A contained neutrinoless event deposits approximately the nuclear Q-value in the two-electron sum, apart from recoil and losses. Ordinary two-neutrino <double beta decay> has a continuous electron-sum <radiation spectrum>. Resolution, escape losses and backgrounds broaden or mimic features, so a peak assignment requires calibrated response, sidebands and appropriate event topology. A null peak search is a limit on a <decay rate> under an efficiency/background model, not proof of Dirac <neutrinos>.
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