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First Results from a Microwave Cavity Axion Search at 24 μ eV

First Results from a Microwave Cavity Axion Search at 24 μ eV 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 g a γ γ ≳ 2 × 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review Letters American Physical Society (APS)

First Results from a Microwave Cavity Axion Search at 24 μ eV

First Results from a Microwave Cavity Axion Search at 24 μ eV

Physical Review Letters , Volume 118 (6): 5 – Feb 9, 2017

Abstract

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 g a γ γ ≳ 2 × 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.

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References (39)

Publisher
American Physical Society (APS)
Copyright
© 2017 American Physical Society
Subject
LETTERS; Gravitation and Astrophysics
ISSN
0031-9007
eISSN
1079-7114
DOI
10.1103/PhysRevLett.118.061302
pmid
28234529
Publisher site
See Article on Publisher Site

Abstract

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 g a γ γ ≳ 2 × 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.

Journal

Physical Review LettersAmerican Physical Society (APS)

Published: Feb 9, 2017

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