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Abstract
The MAJORANA DEMONSTRATOR is an experiment constructed to search for neutrinoless double-beta decays in germanium-76 and to demonstrate the feasibility to deploy a ton-scale experiment in a phased and modular fashion. It consists of two modular arrays of natural and 76Ge-enriched germanium detectors totaling 44.1kg (29.7kg enriched detectors), located at the 4850’ level of the Sanford Underground Research Facility in Lead, South Dakota, USA. Data taken with this setup since summer 2015 at different construction stages of the experiment show a clear reduction of the observed background index around the ROI for 0νββ- decay search due to improvements in shielding. We discuss the statistical approaches to search for a धνββ-signal and derive the physics sensitivity for an expected exposure of 10kg· y from enriched detectors using a profile likelihood based hypothesis test in combination with toy Monte Carlo data.
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Details
1 Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
2 Center for Experimental Nuclear Physics and Astrophysics, and Department of Physics, University of Washington, Seattle, WA, USA
3 Pacific Northwest National Laboratory, Richland, WA, USA
4 Department of Physics and Astronomy, University of South Carolina, Columbia, SC, USA; Oak Ridge National Laboratory, Oak Ridge, TN, USA
5 National Research Center “Kurchatov Institute” Institute for Theoretical and Experimental Physics, Moscow, Russia
6 Department of Physics, University of South Dakota, Vermillion, SD, USA
7 Oak Ridge National Laboratory, Oak Ridge, TN, USA
8 Max-Planck-Institut fur Physik, München, Germany
9 Joint Institute for Nuclear Research, Dubna, Russia
10 Department of Physics, University, Durham, NC, USA; Triangle Universities Nuclear Laboratory, Durham, NC, USA
11 Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC, USA; Triangle Universities Nuclear Laboratory, Durham, NC, USA
12 South Dakota School of Mines and Technology, Rapid City, SD, USA
13 Los Alamos National Laboratory, Los Alamos, NM, USA
14 Center for Experimental Nuclear Physics and Astrophysics, and Department of Physics, University of Washington, Seattle, WA, USA; Physik Department, Technische Universitat, München, Germany
15 Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, USA; Oak Ridge National Laboratory, Oak Ridge, TN, USA
16 Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka, Japan
17 Department of Physics, Princeton University, Princeton, NJ, USA
18 Department of Physics, North Carolina State University, Raleigh, NC, USA; Triangle Universities Nuclear Laboratory, Durham, NC, USA; Oak Ridge National Laboratory, Oak Ridge, TN, USA
19 Department of Physics and Astronomy, University of South Carolina, Columbia, SC, USA
20 Department of Physics, Black Hills State University, Spearfish, SD, USA
21 Tennessee Tech University, Cookeville, TN, USA
22 Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, USA
23 Department of Physics, Engineering Physics and Astronomy, Queen’s University, Kingston, ON, Canada
24 Max-Planck-Institut fur Physik, München, Germany; Present address: Centro de Investigaciones Energeticas, Medioambientales y Tecnológicas, CIEMAT, 28040, Madrid, Spain
25 Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC, USA; Triangle Universities Nuclear Laboratory, Durham, NC, USA; Oak Ridge National Laboratory, Oak Ridge, TN, USA