Speaker
Description
The MAJORANA DEMONSTRATOR recently concluded its search for neutrinoless double-beta decay. The experiment operated an array of up to 40.4 kg of germanium detectors, 27 kg of which were isotopically enriched in $^{76}$Ge and housed inside a compact shield consisting of lead and copper at the Sanford Underground Research Facility (SURF) in Lead, SD. The experiment achieved a world leading energy resolution of 0.12% FWHM at 2039 keV, one of the lowest background rates in the region of the 0νββ Q-value, 15.7 cnts/(FWHM t y), and set a 0νββ half-life limit of T$_{1/2}$ > 8.3×10$^{25}$ yrs based on full exposure, resulting in the effective neutrino mass range of 113 < m$_{\beta \beta}$ < 269 meV. The DEMONSTRATOR continues to run with a single module with natural abundance BEGe detectors for background studies and other physics searches. This talk will present the MJD results on the search for neutrinoless double beta decay as well as the broader underground physics program.
This material is supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, the Particle Astrophysics and Nuclear Physics Programs of the National Science Foundation, and the Sanford Underground Research Facility.
