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Title: The Majorana Demonstrator Status and Preliminary Results

The MAJORANA Collaboration is using an array of high-purity Ge detectors to search for neutrinoless double-beta decay in 76Ge. Searches for neutrinoless double-beta decay are understood to be the only viable experimental method for testing the Majorana nature of the neutrino. Observation of this decay would imply violation of lepton number, that neutrinos are Majorana in nature, and provide information on the neutrino mass. The MAJORANA DEMONSTRATOR comprises 44.1 kg of p-type point-contact Ge detectors (29.7 kg enriched in 76Ge) surrounded by a low-background shield system. The experiment achieved a high efficiency of converting raw Ge material to detectors and an unprecedented detector energy resolution of 2.5 keV FWHM at Q ββ. The MAJORANA collaboration began taking physics data in 2016. Here, this paper summarizes key construction aspects of the Demonstrator and shows preliminary results from initial data.
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Publication Date:
Report Number(s):
LA-UR-18-22409
Journal ID: ISSN 2100-014X
Grant/Contract Number:
AC52-06NA25396; AC05-00OR22725; AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
EPJ Web of Conferences
Additional Journal Information:
Journal Volume: 178; Conference: The 16th International Symposium on Capture-Gamma Ray Spectrum and Related Topics, Shanghai (China), 18-22 Sep 2017; Journal ID: ISSN 2100-014X
Publisher:
EDP Sciences
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Science Foundation (NSF); Russian Foundation for Basic Research; Natural Sciences and Engineering Research Council of Canada (NSERC)
Contributing Orgs:
Majorana Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Atomic and Nuclear Physics; Majorana Demonstrator; double beta decay; low background experiment; underground experiment
OSTI Identifier:
1455001
Alternate Identifier(s):
OSTI ID: 1460320