Kavli Affiliate: Blas Cabrera
| 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 $left(19.7^+0.6_-0.5right)$ eV for germanium. This has implications for the analysis thresholds of future germanium-based dark matter searches.
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