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Brubaker, B M; Zhong, L; Gurevich, Y V; Cahn, S B; Lamoreaux, S K; Simanovskaia, M; Root, J R; Lewis, S M; Al Kenany, S; Backes, K M; Urdinaran, I; Rapidis, N M; Shokair, T M; van Bibber, K A; Palken, D A; Malnou, M; Kindel, W F; Anil, M A; Lehnert, K W; Carosi, G
Physical review letters, 02/2017, Letnik: 118, Številka: 6Journal Article
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 g_{aγγ}≳2×10^{-14} GeV^{-1} over the range 23.55<m_{a}<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.
