First results from a microwave cavity axion search at 24 μ eV

B. M. Brubaker*, L. Zhong, Y. V. Gurevich, S. B. Cahn, S. K. Lamoreaux, M. Simanovskaia, J. R. Root, S. M. Lewis, S. Al Kenany, K. M. Backes, I. Urdinaran, N. M. Rapidis, T. M. Shokair, K. A. Van Bibber, D. A. Palken, M. Malnou, W. F. Kindel, M. A. Anil, K. W. Lehnert, G. Carosi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

234 Citations (Scopus)


We report on the first results from a new microwave cavity search for dark matter axions with masses above 20 μ eV. We exclude axion models with two-photon coupling gaγγ ≳ 2 x 10-14 GeV-1 over the range 23.55 <m(a) <24.0 μ eV. 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.

Original languageEnglish
Article number061302
Pages (from-to)1-5
Number of pages5
JournalPhysical Review Letters
Issue number6
Publication statusPublished - 9 Feb 2017
Externally publishedYes


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