期刊
PHYSICAL REVIEW LETTERS
卷 118, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.061302
关键词
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资金
- National Science Foundation [PHY-1362305, PHY-1306729]
- Heising-Simons Foundation [2014-181, 2014-182, 2014-183]
- U.S. Department of Energy through Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1362305] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1607417] Funding Source: National Science Foundation
We report on the first results from a new microwave cavity search for dark matter axions with masses above 20 mu eV. We exclude axion models with two-photon coupling g(a gamma gamma) greater than or similar to 2 x 10(-14) GeV-1 over the range 23.55 < m(a) < 24.0 mu 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.
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