First Results from LEGEND-200's search for Neutrinoless Double-Beta Decay

ORAL

Abstract

LEGEND-200 is searching for neutrinoless double-beta decay (0νββ), a hypothetical lepton-number violating process that would prove the neutrino is a majorana particle if discovered. The experiment consists of an array of point-contact high purity germanium detectors isotopically enriched in 76Ge, which are submerged in liquid argon that acts as an active shield. During its first year of operation underground at Laboratori Nazionali del Gran Sasso in Italy, LEGEND-200 collected 61.0 kg-yr of exposure. This talk will present an overview of LEGEND-200 and new results from the first year of data-taking.

*This work is supported by the U.S. DOE, and the NSF, the LANL, ORNL and LBNL LDRD programs; the European ERC and Horizon programs; the German DFG, BMBF, and MPG; the Italian INFN; the Polish NCN and MNiSW; the Czech MEYS; the Slovak RDA; the Swiss SNF; the UK STFC; the Canadian NSERC and CFI; the LNGS and SURF facilities.

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Publication: H. Acharya et al., Phys. Rev. Lett. (Accepted 2025)
https://doi.org/10.1103/25tk-nctn

Presenters

  • Ian Guinn

    • Oak Ridge National Laboratory

Authors

  • Ian Guinn

    • Oak Ridge National Laboratory