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The MAJORANA DEMONSTRATOR will search for the neutrinoless double-beta decayof the 76Ge isotope with a mixed array of enriched and natural germaniumdetectors. The observation of this rare decay would indicate the neutrino isits own anti-particle, demonstrate that lepton number is not conserved, andprovide information on the absolute mass-scale of the neutrino. TheDEMONSTRATOR is being assembled at the 4850 foot level of the SanfordUnderground Research Facility in Lead, South Dakota. The array will becontained in a low-background environment and surrounded by passive and activeshielding. The goals for the DEMONSTRATOR are: demonstrating a background rateless than 3 t$^{-1}$ y$^{-1}$ in the 4 keV region of interest (ROI) surroundingthe 2039 keV 76Ge endpoint energy; establishing the technology required tobuild a tonne-scale germanium based double-beta decay experiment; testing therecent claim of observation of neutrinoless double-beta decay [H. V.Klapdor-Kleingrothaus and I. V. Krivosheina, Mod. Phys. Lett. A21, 1547(2006)]; and performing a direct search for light WIMPs (3-10 GeV).

The MAJORANA DEMONSTRATOR: Progress towards showing the feasibility of a tonne-scale 76Ge neutrinoless double-beta decay experiment