Phonon-Based Position Determination in SuperCDMS iZIP Detectors
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10909_2013_1015_ReferencePDF.pdf
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1.79 MB
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Author(s)
Anderson, Adam
Anderson, Adam Jonathan
Date Issued
January 2014
Journal
Journal of Low Temperature Physics
Publisher
Springer-Verlag
Citation
Anderson, Adam. “Phonon-Based Position Determination in SuperCDMS iZIP Detectors.” J Low Temp Phys 176, no. 5–6 (January 6, 2014): 959–965. © 2014 Springer Science+Business Media New York
Version
Author's final manuscript
Abstract
SuperCDMS is currently operating a 10-kg array of cryogenic germanium detectors in the Soudan Underground Laboratory to search for weakly interacting massive particles, a leading dark matter candidate. These detectors, known as iZIPs, measure ionization and athermal phonons from particle interactions with sensors on both sides of a Ge crystal. The ionization signal can be used to efficiently tag events at high radius and near the top and bottoms surfaces, where diminished charge collection can cause events to mimic WIMP-induced nuclear recoils. Using calibration data taken with a [superscript 206] Pb source underground at Soudan, we demonstrate rejection of surface events of (4.5±0.9)×10[superscript −4] with 46 % acceptance of nuclear recoils using the phonon signal only. We also show with [superscript 133] Ba calibration data underground that the phonon channels can efficiently identify events near the sidewall. This phonon-based approach can also be extended to lower energies than the ionization-based position reconstruction.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1007/s10909-013-1015-2
