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We report the results of a QCD axion dark matter search with discovery ability for Dine-Fischler-Srednicki-Zhitnitsky (DFSZ) axions using an axion haloscope. Sub-Kelvin noise temperatures are reached with an ultra low-noise Josephson parametric amplifier cooled by a dilution refrigerator. This work excludes (with a 90% confidence level) DFSZ axions with masses between 3. 27 to 3. 34 eV, assuming a standard halo model with a local energy density of 0. 45 GeV/cc made up 100% of axions.
Bartram et al. (Tue,) studied this question.
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