Abstract
The Majorana Demonstrator is searching for neutrinoless double-beta decay in 76Ge with two modular arrays of natural and 76Ge-enriched germanium detectors. It is located at the 4850' level of Sanford Underground Research Facility in Lead, South Dakota, USA, and its total mass of germanium detectors is 44.1 kg, of which 29.7 kg is enriched. The analysis of the first 26 kg-yr of data provides an unprecedented energy resolution of 0.13% in the region of interest at 2039 keV and a background level of 15.4 ±2.0 counts/(FWHM t yr). It establishes the lower limit of the half-life of neutrinoless double beta decay as 2.7 1025 yr in 76Ge at 90% CL. This analysis will be summarized here with an emphasis on the energy determination.
Original language | English |
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Title of host publication | Workshop on Calculation of Double-Beta-Decay Matrix Elements, MEDEX 2019 |
Editors | Osvaldo Civitarese, Ivan Stekl, Jouni Suhonen |
Publisher | American Institute of Physics Inc. |
ISBN (Electronic) | 9780735419100 |
DOIs | |
State | Published - Oct 25 2019 |
Event | 12th Workshop on Calculation of Double-Beta-Decay Matrix Elements, MEDEX 2019 - Prague, Czech Republic Duration: May 27 2019 → May 31 2019 |
Publication series
Name | AIP Conference Proceedings |
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Volume | 2165 |
ISSN (Print) | 0094-243X |
ISSN (Electronic) | 1551-7616 |
Conference
Conference | 12th Workshop on Calculation of Double-Beta-Decay Matrix Elements, MEDEX 2019 |
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Country/Territory | Czech Republic |
City | Prague |
Period | 05/27/19 → 05/31/19 |
Funding
This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, the Particle Astrophysics and Nuclear Physics Programs ofthe National Science Foundation, and the Sanford Underground Research Facility. It is also funded by the National Science Foundation under Grant No. 1812356.