Phonon-Based Position Determination in SuperCDMS iZIP Detectors

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 interaction...

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Bibliographic Details
Published inarXiv.org
Main Authors Anderson, A J, the SuperCDMS Collaboration
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 16.05.2014
Subjects
Calibration
Dark matter
Detectors
Germanium
Ionization
Lead isotopes
Particle interactions
Phonons
Physics - Instrumentation and Detectors
Physics - Instrumentation and Methods for Astrophysics
Sensors
Weakly interacting massive particles
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Summary: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 210Pb source underground at Soudan, we demonstrate rejection of surface events of (4.5 +/- 0.9) x 10^-4 with 46% acceptance of nuclear recoils using the phonon signal only. We also show with 133Ba 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.
ISSN:2331-8422
DOI:10.48550/arxiv.1405.4215