MAJORANA: An Ultra-Low Background Enriched-Germanium Detector Array for Fundamental Physics Measurements

The {\sc Majorana} collaboration aims to perform a search for neutrinoless double-beta decay (0$\nu\beta\beta$) by fielding arrays of HPGe detectors mounted in ultra-clean electroformed-copper cryostats located deep underground. Recent advances in HPGe detector technology, in particular P-type Point-Contact (PPC) detectors, show great promise for identifying and reducing backgrounds to the 0$\nu\beta\beta$ signal, which should result in improved sensitivity over previous generation experiments. The ultra-low energy threshold possible in PPC detectors also enables a broader physics program including sensitive searches for dark matter and axions. The {\sc Majorana Demonstrator} R\&D program will field three $\sim$20~kg modules of PPC detectors at Sanford Underground Laboratory. Half of the detector mass will be enriched to 86\% in $^{76}$Ge. I will present the motivation, design, recent progress and current status of this R\&D effort, and discuss its physics reach.