arXiv · 1805.09942
Energy Loss Due to Defect Formation from $^{206}$Pb Recoils in SuperCDMS Germanium Detectors
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 $^{210}$Pb sources. We examine the spectrum of $^{206}$Pb nuclear recoils near its expected 103 keV endpoint energy and determine an energy loss of $\left(6.08\pm0.18\right)$ %, 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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Robert Agnese, Taylor Aralis, Tsuguo Aramaki, Isaac Arnquist, Elham Azadbakht, William Baker, Samir Banik, D'Ann Barker, Dan Bauer, Thomas Binder, Michael Bowles, Paul Brink, Ray Bunker, Blas Cabrera, Robert Calkins, Concetta Cartaro, David Cerdeno, Yen-Yung Chang, Jodi Cooley, Brett Cornell, Priscilla Cushman, Philippe Di Stefano, Todd Doughty, Eleanor Fascione, Tali Figueroa, Caleb Fink, Matt Fritts, Gilles Gerbier, Richard Germond, Muad Ghaith, Sunil Golwala, Rusty Harris, Ziqing Hong, Eric Hoppe, Lauren Hsu, Martin Huber, Vijay Iyer, Dan Jardin, Chitrasen Jena, Michael Kelsey, Allison Kennedy, Andrew Kubik, Noah Kurinsky, Richard Lawrence, Ben Loer, Elias Lopez-Asamar, Pat Lukens, Danika MacDonell, Rupak Mahapatra, Vuk Mandic, Nicholas Mast, Eric Miller, Nader Mirabolfathi, Bedangadas Mohanty, Jorge Morales, Jack Nelson, John Orrell, Scott Oser, William Page, Richard Partridge, Mark Pepin, Francisco Ponce, Sudip Poudel, Matt Pyle, Hang Qiu, Wolfgang Rau, Angela Reisetter, Tom Ren, Tyler Reynolds, Amy Roberts, Alan Robinson, Hannah Rogers, Tarek Saab, Bernard Sadoulet, Joel Sander, Andrew Scarff, Richard Schnee, Silvia Scorza, Kartik Senapati, Bruno Serfass, Danielle Speller, Matthew Stein, Joseph Street, Hirohisa Tanaka, David Toback, Ryan Underwood, Anthony Villano, Belina von Krosigk, Samuel Watkins, Jon Wilson, Matthew Wilson, Joshua Winchell, Dennis Wright, Steve Yellin, Betty Young, Xiaohe Zhang, Xuji Zhao. 2018-05-25. Energy Loss Due to Defect Formation from $^{206}$Pb Recoils in SuperCDMS Germanium Detectors. https://doi.org/10.1063/1.5041457
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