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CAGE Scanner: Investigating Surface Backgrounds in HPGe Detectors for LEGEND

Not scheduled


Gulden Othman (University of North Carolina- Chapel Hill)


A potential source of backgrounds in a ton-scale $^{76}$Ge-based neutrinoless double-beta decay program could arise from particle interactions occurring near the surfaces of high purity germanium (HPGe) detectors. The Collimated Alphas, Gammas, and Electrons scanner (CAGE) is a test stand that allows for in-depth studies of surface events by using vacuum-side, collimated radiation sources to characterize the response of HPGe detectors to radiation at specific locations on the detector surface. LEGEND is a search for neutrinoless double-beta decay in the $^{76}$Ge isotope that will begin operation of a 200 kg array in 2021, with a plan to scale up to 1000 kg of $^{76}$Ge-enriched HPGe detectors in a phased approach. To maximize LEGEND-1000's discovery sensitivity, understanding and discriminating against backgrounds from surface events is essential. In this work we present the design, operation, and current results from CAGE.


Novel test-stand aids in understanding of potential surface backgrounds in HPGe detectors for LEGEND

Experiment/Collaboration LEGEND

Primary author

Gulden Othman (University of North Carolina- Chapel Hill)


Clint Wiseman (University of Washington) Jason Detwiler (University of Washington) Timothy Mathew (University of Washington)

Presentation materials