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

Agnese, R. and Aralis, T. and Chang, Y.-Y. and Cornell, B. and Golwala, S. R. (2018) Energy loss due to defect formation from ^(206)Pb recoils in SuperCDMS germanium detectors. Applied Physics Letters, 113 (9). Art. No. 092101. ISSN 0003-6951. doi:10.1063/1.5041457.

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The Super Cryogenic Dark Matter Search experiment at the Soudan Underground Laboratory studied energy loss associated with 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 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 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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Chang, Y.-Y.0000-0002-6441-980X
Golwala, S. R.0000-0002-1098-7174
Alternate Title:Energy loss due to defect formation from 206Pb recoils in SuperCDMS germanium detectors
Additional Information: © 2018 AIP Publishing LLC. (Received 24 May 2018; accepted 13 August 2018; published online 27 August 2018) The SuperCDMS collaboration gratefully acknowledges technical assistance from the staff of the Soudan Underground Laboratory and the Minnesota Department of Natural Resources. The iZIP detectors were fabricated in the Stanford Nanofabrication Facility, which is a member of the National Nanofabrication Infrastructure Network, sponsored and supported by the NSF. We would like to thank François Schiettekatte for his feedback in reviewing an early manuscript. Funding and support were received from the National Science Foundation, the U.S. Department of Energy, Fermilab URA Visiting Scholar Grant No. 15-S-33, NSERC Canada, the Canada First Research Excellence Fund, and MultiDark (Spanish MINECO). This document was prepared by the SuperCDMS collaboration using the resources of the Fermi National Accelerator Laboratory (Fermilab), a U.S. Department of Energy, Office of Science, HEP User Facility. Fermilab is managed by Fermi Research Alliance, LLC (FRA), acting under Contract No. DE-AC02-07CH11359. Pacific Northwest National Laboratory is operated by Battelle Memorial Institute under Contract No. DE-AC05-76RL01830 for the U.S. Department of Energy. SLAC is operated under Contract No. DEAC02-76SF00515 with the U.S. Department of Energy.
Group:Astronomy Department
Funding AgencyGrant Number
Department of Energy (DOE)DEAC02-76SF00515
Department of Energy (DOE)DE-AC02-07CH11359
Department of Energy (DOE)DE-AC05-76RL01830
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Canada First Research Excellence FundUNSPECIFIED
Issue or Number:9
Record Number:CaltechAUTHORS:20180827-094621698
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89160
Deposited By: George Porter
Deposited On:27 Aug 2018 21:33
Last Modified:16 Nov 2021 00:33

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