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Title: Status of the MAJORANA DEMONSTRATOR

Conference ·
DOI:https://doi.org/10.1063/1.4934894· OSTI ID:1343522
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  1. University of Washington, Seattle
  2. Lawrence Berkeley National Laboratory (LBNL)
  3. Pacific Northwest National Laboratory (PNNL)
  4. University of South Carolina
  5. Oak Ridge National Laboratory (ORNL)
  6. Institute of Theoretical & Experimental Physics (ITEP), Moscow, Russia
  7. Joint Institute for Nuclear Research, Dubna, Russia
  8. Duke University/TUNL
  9. University of South Dakota
  10. South Dakota School of Mines and Technology
  11. Los Alamos National Laboratory (LANL)
  12. University of Tennessee, Knoxville (UTK)
  13. Osaka University, Japan
  14. University of North Carolina, Chapel Hill / Triangle Universities Nuclear Laboratory, Durham, NC
  15. University of North Carolina / Triangle Universities Nuclear Lababoratory, Durham
  16. University of South Carolina, Columbia
  17. Black Hills State University, Spearfish, South Dakota
  18. Tennessee Technological University (TTU)
  19. UNC/Triangle Univ. Nucl. Lab, Durham, NC/ORNL
+ Show Author Affiliations

The MAJORANA Collaboration is constructing the MAJORANA DEMONSTRATOR, an ultra-low background, modular, HPGe detector array with a mass of 44-kg (29 kg Ge-76 and 15 kg Ge-nat) to search for neutrinoless double beta decay in Ge-76. The next generation of tonne-scale Ge-based neutrinoless double beta decay searches will probe the neutrino mass scale in the inverted-hierarchy region. The MAJORANA DEMONSTRATOR is envisioned to demonstrate a path forward to achieve a background rate at or below 1 count/tonne/year in the 4 keV region of interest around the Q-value of 2039 keV. The MAJO-RANA DEMONSTRATOR follows a modular implementation to be easily scalable to the next generation experiment. First, the prototype module was assembled; it has been continuously taking data from July 2014 to June 2015. Second, Module 1 with more than half of the total enriched detectors and some natural detectors has been assembled and it is being commissioned. Finally, the assembly of Module 2, which will complete MAJORANA DEMONSTRATOR, is already in progress.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-00OR22725
OSTI ID:
1343522
Resource Relation:
Journal Volume: 1685; Conference: Workshop on Calculation of Double-beta-decay Matrix Elements (MEDEX '15) - Prague, , Czech Republic - 6/9/2015 12:00:00 AM-6/12/2015 12:00:00 AM
Country of Publication:
United States
Language:
English

References (15)

IGEX 76 Ge neutrinoless double-beta decay experiment: Prospects for next generation experiments journal May 2002
The Evidence for the Observation of 0νββ Decay: the Identification of 0νββ Events from the full Spectra journal June 2006
Improved measurement of the 2 ν β β half-life of 136 Xe with the EXO-200 detector journal January 2014
Large-mass ultralow noise germanium detectors: performance and applications in neutrino and astroparticle physics journal September 2007
Pulse shape discrimination studies with a Broad-Energy Germanium detector for signal identification and background suppression in the GERDA double beta decay experiment journal October 2009
Double beta decay, Majorana neutrinos, and neutrino mass journal April 2008
The MAJORANA DEMONSTRATOR Neutrinoless Double-Beta Decay Experiment journal January 2014
Limit on Neutrinoless β β Decay of Xe 136 from the First Phase of KamLAND-Zen and Comparison with the Positive Claim in Ge 76 journal February 2013
Results on Neutrinoless Double- β Decay of Ge 76 from Phase I of the GERDA Experiment journal September 2013
Low capacitance large volume shaped-field germanium detector journal January 1989
The IGEX experiment reexamined: A response to the critique of Klapdor-Kleingrothaus, Dietz, and Krivosheina journal October 2004
Limits on the Majorana Neutrino Mass in the 0.1 eV Range journal July 1999
The Sanford Underground Research Facility at Homestake journal May 2015
Neutrino Masses and Mixings: Status and Prospects journal November 2008
Theory of neutrinoless double-beta decay journal September 2012

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Related Subjects

neutrinoless double-beta decay
germanium detector
Majorana neutrino mass
NEUTRINO MASS
DECAY