PPC 2022: XV International Conference on Interconnections between Particle Physics and Cosmology

Search for neutrinoless double-beta decays in Ge-76 in the LEGEND experiment

8 Jun 2022, 14:15

15m

Parallel

Speaker

Valentina Biancacci

Description

The observation of neutrinoless double-beta ($0\nu \beta \beta$) decay would establish both the violation of lepton number conservation and the Majorana nature of the neutrino. It would also constrain the neutrino mass scale in the picture of light-neutrino exchange.
The best limit on the $0\nu \beta \beta$ half-life of ${}^{76}$Ge, one of the most promising isotopes to search for it, is $1.8\cdot {10}^{26}$ at 90% C.L..
LEGEND follows the GERDA and MAJORANA DEMONSTRATOR collaborations, which have achieved the lowest background and best energy resolution in the signal region of any experiment searching for $0\nu \beta \beta$.
Building on their success, the LEGEND collaboration pursues a tonne-scale ${}^{76}$Ge experiment in a staged approach, properly using existing resources to expedite physics results.
The first stage, LEGEND-200, is currently being installed at the Laboratori Nazionali del Gran Sasso (Italy) in the existing GERDA infrastructure.
The half-life discovery potential of the proposed tonne-scale stage, LEGEND-1000, lies beyond ${10}^{28}$ years and will allow exploring the parameter space of the inverted neutrino mass ordering.

Presentation materials

2022-06-06-Biancacci-PPC2022-StLouis.pdf