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Axions in the microeV mass range are a plausible cold dark-matter candidate and may be detected by their conversion into microwave photons in a resonant cavity immersed in a static magnetic field. We report the first result from such an axion search using a superconducting first-stage amplifier (SQUID) replacing a conventional GaAs field-effect transistor amplifier. This experiment excludes KSVZ dark-matter axions with masses between 3.3 microeV and 3.53 microeV and sets the stage for a definitive axion search utilizing near quantum-limited SQUID amplifiers.
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Asztalos et al. (Thu,) studied this question.
synapsesocial.com/papers/69dd4d148557d5ab8f40cc17 — DOI: https://doi.org/10.1103/physrevlett.104.041301
S. J. Asztalos
Argonne National Laboratory
G. Carosi
Lawrence Livermore National Laboratory
C. Hagmann
Lawrence Livermore National Laboratory
Physical Review Letters
University of Washington
Lawrence Berkeley National Laboratory
University of Florida
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