Demonstration of surface electron rejection with interleaved germanium detectors for dark matter searches
Abstract
The SuperCDMS experiment in the Soudan Underground Laboratory searches for dark matter with a 9-kg array of cryogenic germanium detectors. Symmetric sensors on opposite sides measure both charge and phonons from each particle interaction, providing excellent discrimination between electron and nuclear recoils, and between surface and interior events. Surface event rejection capabilities were tested with two ^(210)Pb sources producing ∼130 beta decays/hr. In ∼800 live hours, no events leaked into the 8–115 keV signal region, giving upper limit leakage fraction 1.7 × 10^(−5) at 90% C.L., corresponding to < 0.6 surface event background in the future 200-kg SuperCDMS SNOLAB experiment.
Additional Information
© 2013 AIP Publishing LLC. Received 26 September 2013; accepted 2 October 2013; published online 17 October 2013. The SuperCDMS collaboration gratefully acknowledges the technical assistance from Jim Beaty and the staff of the Soudan Underground Laboratory and the Minnesota Department of Natural Resources. These iZIP detectors are fabricated in the Stanford Nanofabrication Facility, which is a member of the National Nanofabrication Infrastructure Network sponsored by NSF under Grant ECS-0335765. This work is supported in part by the National Science Foundation (Grant Nos. AST-9978911, NSF-0847342, PHY-1102795, NSF-1151869, PHY-0542066, PHY-0503729, PHY-0503629, PHY-0503641, PHY-0504224, PHY-0705052, PHY-0801708, PHY-0801712, PHY-0802575, PHY-0847342, PHY-0855299, PHY-0855525, and PHY-1205898), by the Department of Energy (Contract Nos. DE-AC03-76SF00098, DE-FG02-92ER40701, DE-FG02-94ER40823, DE-FG03-90ER40569, DE-FG03-91ER40618, and DE-SC0004022), by NSERC Canada (Grant Nos. SAPIN 341314 and SAPPJ 386399), and by MULTIDARK CSD2009-00064 and FPA2012-34694. Fermilab is operated by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359, while SLAC is operated under Contract No. DE-AC02-76SF00515 with the United States Department of Energy.Attached Files
Published - 1.4826093.pdf
Submitted - 1305.2405v3.pdf
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Additional details
- Eprint ID
- 42632
- Resolver ID
- CaltechAUTHORS:20131121-150215822
- NSF
- ECS-0335765
- NSF
- AST-9978911
- NSF
- NSF-0847342
- NSF
- PHY-1102795
- NSF
- NSF-1151869
- NSF
- PHY-0542066
- NSF
- PHY-0503729
- NSF
- PHY-0503629
- NSF
- PHY-0503641
- NSF
- PHY-0504224
- NSF
- PHY-0705052
- NSF
- PHY-0801708
- NSF
- PHY-0801712
- NSF
- PHY-0802575
- NSF
- PHY-0847342
- NSF
- PHY-0855299
- NSF
- PHY-0855525
- NSF
- PHY-1205898
- Department of Energy (DOE)
- DE-AC03- 76SF00098
- Department of Energy (DOE)
- DE-FG02-92ER40701
- Department of Energy (DOE)
- DE-FG02-94ER40823
- Department of Energy (DOE)
- DE-FG03-90ER40569
- Department of Energy (DOE)
- DE-FG03-91ER40618
- Department of Energy (DOE)
- DE-SC0004022
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- SAPIN 341314
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- SAPPJ 386399
- MULTIDARK
- CSD2009-00064
- MULTIDARK
- FPA2012-34694
- Department of Energy (DOE)
- DE-AC02-07CH11359
- Department of Energy (DOE)
- DE-AC02-76SF00515
- Created
-
2013-11-21Created from EPrint's datestamp field
- Updated
-
2021-11-10Created from EPrint's last_modified field