Kavli Affiliate: Clarence L. Chang
| First 5 Authors: Robin Anthony-Petersen, Clarence L. Chang, Yen-Yung Chang, Luke Chaplinsky, Caleb W. Fink
| Summary:
We describe observations of low energy excess (LEE) events (background events
observed in all light dark matter direct detection calorimeters) and noise in a
two-channel silicon athermal phonon detector with 375 meV baseline energy
resolution. We measure two distinct LEE populations: “shared” multichannel
events with a pulse shape consistent with athermal phonon events, and sub-eV
events which couple nearly exclusively to a single channel with a significantly
faster pulse shape. These “singles” are consistent with events occurring
within the aluminum athermal phonon collection fins. Similarly, our measured
detector noise is higher than the theoretical expectation. Measured noise can
be split into an uncorrelated component, consistent with shot noise from small
energy depositions within the athermal phonon sensor itself, and a correlated
component, consistent with shot noise from energy depositions within the
silicon crystal’s phonon system.
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