Results of the MAJORANA DEMONSTRATOR’s Search for Double-Beta Decay of 76Ge to Excited States of 76Se
- University of North Carolina, Chapel Hill, NC (United States); Triangle Universities Nuclear Laboratory, Durham, NC (United States); Osaka University (Japan)
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); University of South Carolina, Columbia, SC (United States)
- National Research Center "Kurchatov Institute" Institute for Theoretical and Experimental Physics, Moscow (Russia)
- University of South Dakota, Vermillion, SD (United States)
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- University of North Carolina, Chapel Hill, NC (United States); South Dakota School of Mines and Technology, Rapid City, SD (United States); Triangle Universities Nuclear Laboratory, Durham, NC (United States)
- Duke University, Durham, NC (United States); Triangle Universities Nuclear Laboratory, Durham, NC (United States)
- University of Washington, Seattle, WA (United States)
- University of North Carolina, Chapel Hill, NC (United States); Triangle Universities Nuclear Laboratory, Durham, NC (United States)
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- South Dakota School of Mines and Technology, Rapid City, SD (United States)
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- University of South Carolina, Columbia, SC (United States)
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); University of Tennessee, Knoxville, TN (United States)
- Osaka University (Japan)
- Williams College, Williamstown, MA (United States)
- North Carolina State University, Raleigh, NC (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Triangle Universities Nuclear Laboratory, Durham, NC (United States)
- Massachusetts Institute of Technology, Cambridge, MA (United States)
- Tennessee Tech University, Cookeville, TN (United States)
- Queen's University, Kingston, ON (Canada)
- Max-Planck-Institut für Physik, München (Germany); Technische Universität, München (Germany)
- University of North Carolina, Chapel Hill, NC (United States); Triangle Universities Nuclear Laboratory, Durham, NC (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
The MAJORANA DEMONSTRATOR is searching for double-beta decay of 76Ge to excited states (E.S.) in 76Se using a modular array of high purity Germanium detectors. 76Ge can decay into three E.S.s of 76Se. The E.S. decays have a clear event signature consisting of a ββ-decay with the prompt emission of one or two γ-rays, resulting in with high probability in a multi-site event. The granularity of the DEMONSTRATOR detector array enables powerful discrimination of this event signature from backgrounds. Using 21.3 kg-y of isotopic exposure, the DEMONSTRATOR has set world leading limits for each E.S. decay, with 90% CL lower half-life limits in the range of (0.56-2.1)∙1024 y. In particular, for the 2ν transition to the first 0+ E.S. of 76Se, a lower half-life limit of 0.68∙1024 at 90% CL was achieved.
- Research Organization:
- Univ. of North Carolina, Chapel Hill, NC (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- Grant/Contract Number:
- FG02-97ER41033; FG02-97ER41041; AC02-05CH11231
- OSTI ID:
- 1658913
- Alternate ID(s):
- OSTI ID: 1658938; OSTI ID: 1670118
- Journal Information:
- Journal of Physics. Conference Series, Vol. 1468; ISSN 1742-6588
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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