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
Transition Edge Sensor based 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 substrate
athermal phonon events, and sub-eV events that 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 substrate’s phonon system.
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