Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published August 27, 2018 | Submitted + Published
Journal Article Open

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

Abstract

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.

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.

Attached Files

Published - 1.5041457.pdf

Submitted - 1805.09942

Files

1.5041457.pdf
Files (1.6 MB)
Name Size Download all
md5:507d778f5732b0f45937f9398330c01e
477.8 kB Download
md5:38da749ab84609a985ca259d684f51da
1.1 MB Preview Download

Additional details

Created:
August 19, 2023
Modified:
October 18, 2023