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This content will become publicly available on March 26, 2019

Title: Search for Neutrinoless Double- β Decay in Ge 76 with the Majorana Demonstrator

The Majorana Collaboration is operating an array of high purity Ge detectors to search for neutrinoless double-β decay in 76Ge. The Majorana Demonstrator comprises 44.1 kg of Ge detectors (29.7 kg enriched in 76Ge) split between two modules contained in a low background shield at the Sanford Underground Research Facility in Lead, South Dakota. In this paper, 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 ββ 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 × 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$$+3.1\atop{-2.5}$$ counts/(FWHM t yr).
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Publication Date:
Report Number(s):
LA-UR-17-29977
Journal ID: ISSN 0031-9007; PRLTAO; ark:/13030/qt0p03r70b
Grant/Contract Number:
AC02-05CH11231; AC52-06NA25396; FG02-97ER41041; FG02-97ER41033; FG02-97ER41042; SC0012612; FG02-10ER41715; SC0010254; FG02-97ER41020; AC05-00OR22725; MRI-0923142; PHY-0855314; PHY-0919270; PHY-1003399; PHY-1003940; PHY-1102292; PHY-1202950; PHY-1206314; PHY-1619611; PHY-7194299; 15-02-02919
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 120; Journal Issue: 13; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Science Foundation (NSF); Russian Foundation for Basic Research; Sanford Underground Research Facility (SURF)
Contributing Orgs:
Majorana Collaboration
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; double beta decay; neutrinoless double beta decay; nuclear structure and decays; Baryon and lepton number symmetries; Atomic and Nuclear Physics
OSTI Identifier:
1438362
Alternate Identifier(s):
OSTI ID: 1429567; OSTI ID: 1436672; OSTI ID: 1454385