New Results from the Majorana Demonstrator's Search for Neutrinoless Double-β Decay

The Majorana Demonstrator is a low background experiment searching for neutrinoless double-β decay in ⁷⁶Ge and is located at the 4,850 ft level at the Sanford Underground Research Facility in Lead, SD. Since the previous 2019 data release, the Majorana Demonstrator has acquired more exposure, upgraded electronic cables and connectors, improved its analysis routines, and successfully operated four ICPC detectors. In March 2021, operation of the enriched detectors concluded to deploy them in the next phase of germanium experiments, LEGEND-200. The Majorana Demonstrator continues to run with a single module of natural abundance BEGe detectors for background studies and other physics searches. This talk will present results from the Majorana Demonstrator which has achieved a half-life sensitivity of 8.1 × 10²⁵ yrs, a background index of 15.7 cts / (FWHM t yr), and a world leading energy resolution of 2.5 keV at the 2039 keV Q_ββ with a full enriched exposure of 64.5 kg yrs.