Journal
PHYSICAL REVIEW LETTERS
Volume 120, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.120.132502
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Funding
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-AC02-05CH11231, DE-AC52-06NA25396, DE-FG02-97ER41041, DE-FG02-97ER41033, DE-FG02-97ER41042, DE-SC0012612, DE-FG02-10ER41715, DE-SC0010254, DE-FG02-97ER41020]
- National Science Foundation [MRI-0923142, PHY-0855314, PHY-0919270, PHY-1003399, PHY-1003940, PHY-1102292, PHY-1202950, PHY-1206314, PHY-1619611, PHY-7194299]
- Russian Foundation for Basic Research [15-02-02919]
- U.S. Department of Energy through the LANL/LDRD Program
- U.S. Department of Energy through the LBNL/LDRD Program
- U.S. Department of Energy through the PNNL/LDRD Program
- DOE Office of Science User Facility [DE-AC02-05CH11231, DE-AC05-00OR22725]
- U.S. Department of Energy (DOE) [DE-SC0010254] Funding Source: U.S. Department of Energy (DOE)
- Direct For Mathematical & Physical Scien
- Division Of Physics [1307204] Funding Source: National Science Foundation
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The MAJORANA Collaboration is operating an array of high purity Ge detectors to search for neutrinoless double-ss decay in Ge-76. The MAJORANA DEMONSTRATOR comprises 44.1 kg of Ge detectors (29.7 kg enriched in Ge-76) split between two modules contained in a low background shield at the Sanford Underground Research Facility in Lead, South Dakota. Here we present results from data taken during construction, commissioning, and the start of full operations. We achieve unprecedented energy resolution of 2.5 keV FWHM at Q(ss ss) and a very low background with no observed candidate events in 9.95 kg yr of enriched Ge exposure, resulting in a lower limit on the half-life of 1.9 x 10(25) yr (90% C.L.). This result constrains the effective Majorana neutrino mass to below 240-520 meV, depending on the matrix elements used. In our experimental configuration with the lowest background, the background is 4.0(-2.5)(+3.1) counts/(FWHMt yr).
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