Energy loss due to defect formation from 206Pb recoils in SuperCDMS germanium detectors

The Super Cryogenic Dark Matter Searchexperiment at the Soudan Underground Laboratory studied energy loss associated with defect formation in germaniumcrystals at mK temperatures using in situ ^(210)Pb sources. We examine the spectrum of ^(206)Pb nuclear recoils near its expected 10^3 keV endpoint energy and determine an energy loss of (6:08 ± 0:18)%, which we attribute to defect formation. From this result and using TRIM simulations, we extract the first experimentally determined average displacement threshold energyof 19.7^(+0.6)_(−0.5) eV for germanium. This has implications for the analysis thresholds of future germanium-based dark matter searches.