Title

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

Document Type

Article

Publication Date

8-27-2018

Publisher

American Institute of Physics

Abstract

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 210Pb sources. We examine the spectrum of 206Pb nuclear recoils near its expected 103 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 energy of (19.7+0.6−0.5) eV for germanium. This has implications for the analysis thresholds of future germanium-based dark matter searches.

Comments

Copyright © 2018 American Institute of Physics Publishing. Reprinted with permission.

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