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Title: Demonstration of surface electron rejection with interleaved germanium detectors for dark matter searches

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 {sup 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{sup −5} at 90% C.L., corresponding to < 0.6 surface event background in the future 200-kg SuperCDMS SNOLAB experiment.
Authors:
; ; ;  [1] ; ; ; ;  [2] ;  [3] ;  [4] ; ; ; ; ;  [3] ; ; ; ; ; more »;  [5] ; ; « less
  1. Department of Physics, University of Florida, Gainesville, Florida 32611 (United States)
  2. Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
  3. Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States)
  4. (United States)
  5. SLAC National Accelerator Laboratory/Kavli Institute for Particle Astrophysics and Cosmology, 2575 Sand Hill Road, Menlo Park, California 94025 (United States)
Publication Date:
OSTI Identifier:
22217912
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 16; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BETA DECAY; COSMIC RADIATION; CRYOGENICS; ELECTRONS; EQUIPMENT; GE SEMICONDUCTOR DETECTORS; KEV RANGE; LEAKS; NONLUMINOUS MATTER; PARTICLE INTERACTIONS; PHONONS; SENSORS; SIGNALS; SURFACES; SYMMETRY