Phonon-Based Position Determination in SuperCDMS iZIP Detectors
Author(s)Anderson, Adam; Anderson, Adam Jonathan
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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.
DepartmentMassachusetts Institute of Technology. Department of Physics
Journal of Low Temperature Physics
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
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