The axion is a hypothetical elementary particle and cold dark matter candidate. In this rf cavity experiment, halo axions entering a resonant cavity immersed in a static magnetic field convert into microwave photons, with the resulting photons detected by a low-noise receiver. The ADMX Collaboration presents new limits on the axion-to-photon coupling and local axion dark matter halo mass density from a rf cavity axion search in the axion mass range 1.9--2.3μeV, broadening the search range to 1.9--3.3μeV. In addition, we report first results from an improved analysis technique.
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Asztalos et al. (2004) studied this question.