2024/01/09 by Tedeschi, David J.
#FOS: Physical sciences #Nuclear Experiment (nucl-ex)
paper · doi:10.48550/arxiv.2401.04782
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 76Ge 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 0vBB Q-value, 15.7 +1.4 -1.3 cnts/(FWHM t y), and set a 0vBB half-life limit of T1/2 > 8.3x1025 yrs based on its full active exposure of 65 kg yr, resulting in limits on the effective neutrino mass of mBB < 113-269 meV.