Description
Double-beta decays are amongst the rarest nuclear processes ever observed and a powerful source of physics beyond the Standard model. Violation of Lorentz symmetry or the existence of new particles, like Majorons or sterile neutrinos, would affect the shape of the measured two-electrons spectrum, originating detectable and characteristic signatures.
Precision studies of the electron sum energies require ultra-low background and an excellent understanding of the experiment’s response. Both are key features of the Germanium Detector Array (GERDA) experiment, which searched for neutrino-less double beta (0$\nu\beta\beta$) decay with enriched high purity germanium detectors in Liquid Argon at Laboratori Nazionali del Gran Sasso (LNGS) in Italy. In this contribution, new results on exotic double-beta decay modes of $^{76}$Ge obtained with data collected during Phase II of the GERDA experiment will be presented.
| Collaboration | GERDA Collaboration |
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