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Low Energy Backgrounds and Excess Noise in a Two-Channel Low-Threshold Calorimeter

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arxiv 2410.16510 v2 pith:5SIZVDLZ submitted 2024-10-21 physics.ins-det

Robin Anthony-Petersen , Clarence L. Chang , Yen-Yung Chang , Luke Chaplinsky , Caleb W. Fink , Maurice Garcia-Sciveres , Wei Guo , Scott A. Hertel
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Xinran Li Junsong Lin Marharyta Lisovenko Rupak Mahapatra William Matava Daniel N. McKinsey David Z. Osterman Pratyush K. Patel Bjoern Penning Mark Platt Matt Pyle Yinghe Qi Maggie Reed Ivar Rydstrom Roger K. Romani Bernard Sadoulet Bruno Serfass Peter Sorensen Burkhant Suerfu Vetri Velan Gensheng Wang Yue Wang Samuel L. Watkins Michael R. Williams
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classification physics.ins-det
keywords eventsnoiseenergyphononathermalconsistentcomponentdepositions
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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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Forward citations

Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Logarithmic Wavelets for Dark Matter--Phonon Scattering

    hep-ph 2026-08 conditional novelty 7.0 of 10

    A logarithmic Haar wavelet basis makes the vector space integration method practical for dark matter phonon scattering, covering the full momentum range with a single projection at sub-percent accuracy.

  2. Broadband phonon production from axion absorption

    hep-ph 2024-11 conditional novelty 7.0 of 10

    Random nuclear spin orientations break momentum conservation, so axion absorption in crystals excites phonons across the whole Brillouin zone, yielding a broadband detection rate proportional to the phonon density of states.

  3. Prospect of the NUCLEUS Experiment at Chooz for Coherent Elastic Neutrino-Nucleus Scattering and New Physics Searches

    hep-ex 2026-03 conditional novelty 6.0 of 10

    Assuming the low-energy background can be eliminated, a 7-gram NUCLEUS detector at Chooz is projected to see coherent neutrino-nucleus scattering at 4.7σ in one year and to set competitive bounds on new neutrino interactions.

  4. Spin-dependent dark matter scattering in quasi-two-dimensional magnets

    hep-ph 2025-01 conditional novelty 6.0 of 10

    Spin-dependent dark matter scattering off magnons in quasi-2D (anti)ferromagnets can produce an order-10 percent daily modulation, offering directional sensitivity for keV to MeV mass dark matter.

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