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Detecting Sub-GeV Dark Matter with Superconducting Nanowires.

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Superconducting nanowires offer a novel approach for detecting sub-GeV dark matter by acting as both target and sensor. This method shows promise for probing dark matter interactions with electrons, setting new experimental bounds.

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Area of Science:

  • Particle Physics
  • Astrophysics
  • Condensed Matter Physics

Background:

  • Direct detection experiments aim to identify dark matter particles through their interactions with detector materials.
  • Existing detectors often face challenges with sensitivity to low-energy deposits and background noise.

Purpose of the Study:

  • To propose and demonstrate the feasibility of using superconducting nanowires for the direct detection of sub-GeV dark matter.
  • To explore dark matter interactions with electrons via scattering and absorption processes.

Main Methods:

  • Utilized a tungsten-silicide superconducting nanowire as both a target and a sensor.
  • Conducted measurements with a prototype device featuring a 0.8-eV energy threshold and 4.3 ng of material.
  • Achieved an exposure of 10,000 seconds with no observed dark counts.

Main Results:

  • Demonstrated the capability of superconducting nanowires to detect low-energy electron recoils.
  • Established meaningful bounds on dark matter-electron interactions.
  • Set the strongest terrestrial limits to date on sub-eV dark photon absorption.

Conclusions:

  • Superconducting nanowires are a viable technology for direct dark matter detection.
  • This approach offers high sensitivity to electron recoils and low dark counts.
  • Future advancements in scale and threshold could open new avenues for dark matter research.