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Creators/Authors contains: "Brink, P_L"

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  1. ; ; ; ; ; ; ; ; ; ; et al (, Applied Physics Letters)
    We present the design and characterization of a large-area Cryogenic PhotoDetector designed for active particle identification in rare event searches, such as neutrinoless double beta decay and dark matter experiments. The detector consists of a 45.6 cm2 surface area by a 1-mm-thick 10.6 g Si wafer. It is instrumented with a distributed network of Quasiparticle-trap-assisted Electrothermal feedback Transition-edge sensors with superconducting critical temperature Tc=41.5 mK to measure athermal phonons released from interactions with photons. The detector is characterized and calibrated with a collimated 55Fe x-ray source incident on the center of the detector. The noise equivalent power is measured to be 1×10−17 W/Hz in a bandwidth of 2.7 kHz. The baseline energy resolution is measured to be σE=3.86±0.04 (stat.)−0.00+0.19 (syst.) eV. The detector also has an expected timing resolution of σt=2.3 μs for 5 σE events. 
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  2. ; ; ; ; ; ; ; ; ; ; et al (, AIP Advances)
    In this letter, we present the performance of a 100 μm × 400 μm × 40 nm W Transition-Edge Sensor with a critical temperature of 40 mK. This device has a noise equivalent power of 1.5×10-18 W/Hz, in a bandwidth of 2.6 kHz, indicating a resolution for Dirac delta energy depositions of 40 ± 5 meV (rms). The performance demonstrated by this device is a critical step toward developing a O(100) meV threshold athermal phonon detector for low-mass dark matter searches. 
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