Kavli Affiliate: Paul Brink
| First 5 Authors: Robert Agnese, Taylor Aralis, Tsuguo Aramaki, Isaac Arnquist, Elham Azadbakht
| Summary:
The Super Cryogenic Dark Matter Search experiment (SuperCDMS) at the Soudan
Underground Laboratory studied energy loss associated with Frenkel defect
formation in germanium crystals at mK temperatures using in situ $^{210}$Pb
sources. We examine the spectrum of $^{206}$Pb nuclear recoils near its
expected 103 keV endpoint energy and determine an energy loss of
$left(6.08pm0.18right)$ %, which we attribute to defect formation. From this
result and using TRIM simulations, we extract the first experimentally
determined average displacement threshold energy of
$left(19.7^{+0.6}_{-0.5}right)$ eV for germanium. This has implications for
the analysis thresholds of future germanium-based dark matter searches.
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