A search for Beyond the Standard Model double-β decay modes of 76Ge has been performed with data collected during the Phase II of the GERmanium Detector Array (Gerda) experiment, located at the Laboratori Nazionali del Gran Sasso of INFN (Italy). Improved limits on the decays involving Majorons have been obtained, compared to previous experiments with 76Ge, with half-life values on the order of 1023 yr. For the first time with 76Ge, limits on Lorentz invariance violation effects in double-β decay have been obtained. The isotropic coefficient å(3) of , which embeds Lorentz violation in double-β decay, has been constrained at the order of 10-6 GeV. We also set the first experimental limits on the search for light exotic fermions in double-β decay, including sterile neutrinos.

Original languageEnglish
Article number012
JournalJournal of Cosmology and Astroparticle Physics
Issue number12
StatePublished - 1 Dec 2022


  • double beta decay
  • neutrino properties
  • particle physics - cosmology connection


Dive into the research topics of 'Search for exotic physics in double-β decays with GERDA Phase II'. Together they form a unique fingerprint.

Cite this