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Probing Majorana neutrinos with double-β decay.

Science 2019 September 6
A discovery that neutrinos are Majorana fermions would have profound implications for particle physics and cosmology. The Majorana character of neutrinos would make possible the neutrinoless double-β (0νββ) decay, a matter-creating process without the balancing emission of antimatter. The Gerda collaboration searches for the 0νββ decay of 76 Ge by operating bare germanium detectors in an active liquid argon shield. With a total exposure of 82.4 kg ⋅ yr, we observe no signal and derive a lower half-life limit of T 1/2 > 0.9 ⋅ 1026 yr (90% C.L.). Our T 1/2 sensitivity assuming no signal is 1.1 ⋅ 1026 yr. Combining the latter with those from other 0νββ decay searches yields a sensitivity to the effective Majorana neutrino mass of 0.07 - 0.16 eV.

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