2016/10/31 by B. M. Brubaker, L. Zhong, Y. V. Gurevich +17 · 2 citations
Physics and Astronomy · #astro-ph.CO #astro-ph.IM #hep-ex
paper · pdf · doi:10.1103/physrevlett.118.061302
published as Phys. Rev. Lett. 118, 061302 (2017) · 5 pages, 3 figures, accepted for publication in PRL. v2: added changes made during the review process
arxiv created 2017/02/09 · arxiv updated 2017/02/10
We report on the first results from a new microwave cavity search for dark matter axions with masses above 20~μeV. We exclude axion models with two-photon coupling gaγγ \gtrsim 2×10-14~GeV-1 over the range 23.55~μeV < ma < 24.0~μeV. These results represent two important achievements. First, we have reached cosmologically relevant sensitivity an order of magnitude higher in mass than any existing limits. Second, by incorporating a dilution refrigerator and Josephson parametric amplifier, we have demonstrated total noise approaching the standard quantum limit for the first time in an axion search.