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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
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 20mueV. We exclude axion models with two-photon coupling g sub()agammagamma> ~2 x 10 super(-14)GeV super(-1) over the range 23.55 < 24.0mueV. 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.
