First physics results from the LEGEND-200 experiment

ORAL

Abstract

The discovery of Neutrinoless double beta decay (0νββ) would provide unambiguous evidence for the Majorana nature of neutrinos, lepton number non-conservation and a measurement of the absolute neutrino mass scale. The Large Enriched Germanium Experiment for Neutrinoless ββ decay (LEGEND) is a phased search for 0νββ in the 76Ge isotope with enriched high-purity germanium (HPGe) detectors. The first phase, LEGEND-200, located at LNGS, Italy, has been successfully acquiring data for over a year with 142 kg of HPGe detectors. With an expected exposure of 1 ton-year and a background index in the region of interest of less than 2 × 10-4 cts/(keV kg yr), LEGEND-200 will reach a discovery sensitivity of a half-life of 1027 years. The performance of the LEGEND-200 experiment over the past year and a limit for the half-life for the 76Ge isotope will be presented.

*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 SRDA; the Swiss SNF; the UK STFC; the Russian RFBR; the Canadian NSERC and CFI; the LNGS, SNOLAB, and SURF facilities.

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Presenters

  • Harisree Krishnamoorthy

    • Oak Ridge National Laboratory

Authors

  • Harisree Krishnamoorthy

    • Oak Ridge National Laboratory