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Physik-Institut Group of Laura Baudis

New lower limit on the half-life of the neutrinoless double beta decay

With the GERDA experiment we search for the lepton number violating neutrinoless double beta decay of 76-Ge with the GERDA experiment.

By operating bare Ge diodes in liquid argon, we have achieved an unprecedented low background level for germanium detectors  of 1 x 10-3 events/(keV kg yr) in the search region. We have increased the exposure for BEGe-type detectors threefold with respect to our previous data release [Nature 544, 2017], and  in the absence of a signal, we set a new lower limit on the half-life of 8.0 x 1025 yr. The manuscript detailing our new results is published in Phys. Rev. Lett. 120, 132503 (2018).

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