Half-life ratios between neutrinoless double beta decay and its positron-emitting electron-capture version can single out a purely right-handed current, predicting a 0νECβ+ half-life in 124Xe about 20 times shorter than for the mass mechanism.
Shirai (KamLAND-Zen), Results and future plans for the KamLAND-Zen experiment, J
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Pinpointing the Mechanism of Neutrinoless Weak Decays with Positrons
Half-life ratios between neutrinoless double beta decay and its positron-emitting electron-capture version can single out a purely right-handed current, predicting a 0νECβ+ half-life in 124Xe about 20 times shorter than for the mass mechanism.