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ADMX low-noise cavity searches for axion dark matter

ADMX searched microwave spectra for conversion of hypothetical Galactic axions and found no statistically significant axion signal. The 2018 report reached benchmark DFSZ sensitivity near 2.66–2.81 microelectronvolts, and the later 2019 preprint reported an extended 2.81–3.31 microelectronvolt search using a Josephson parametric amplifier and alternative cavity configurations.

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What is recorded here?

ADMX searched microwave spectra for conversion of hypothetical Galactic axions and found no statistically significant axion signal. The 2018 report reached benchmark DFSZ sensitivity near 2.66–2.81 microelectronvolts, and the later 2019 preprint reported an extended 2.81–3.31 microelectronvolt search using a Josephson parametric amplifier and alternative cavity configurations.

Source-linked catalogue note. A detailed explanatory guide has not yet been prepared for this entry.

Scientific scope

The exclusion limits assume specific local axion densities and velocity distributions, apply to the examined frequencies and quoted confidence level, and do not rule out all axion dark matter or establish a detection. The earlier result vetoes a radio-interference interval; the later report lists five mode-crossing gaps where no limit was set, despite filling three others with alternate rod configurations. Its apparent persistent candidate at 730.195 MHz was an intentionally blinded synthetic injection, not a discovery; two other persistent signals were attributed to radio interference after checks. The 2018 and 2019 reports have different author lists; the individual list shown for the later report is incomplete.

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People and systems

N. Du; N. Force; R. Khatiwada; E. Lentz; R. Ottens; L. J. Rosenberg; G. Rybka; G. Carosi; N. Woollett; D. Bowring; A. S. Chou; A. Sonnenschein; W. Wester; C. Boutan; N. S. Oblath; R. Bradley; E. J. Daw; A. V. Dixit; J. Clarke; S. R. O’Kelley; N. Crisosto; J. R. Gleason; S. Jois; P. Sikivie; I. Stern; N. S. Sullivan; D. B. Tanner; G. C. Hilton; T. Braine; R. Cervantes

These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged. The recorded author list is incomplete.

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English catalogue narrative

ADMX low-noise cavity searches for axion dark matter

ADMX searched microwave spectra for conversion of hypothetical Galactic axions and found no statistically significant axion signal. The 2018 report reached benchmark DFSZ sensitivity near 2.66–2.81 microelectronvolts, and the later 2019 preprint reported an extended 2.81–3.31 microelectronvolt search using a Josephson parametric amplifier and alternative cavity configurations.

Scientific scope

The exclusion limits assume specific local axion densities and velocity distributions, apply to the examined frequencies and quoted confidence level, and do not rule out all axion dark matter or establish a detection. The earlier result vetoes a radio-interference interval; the later report lists five mode-crossing gaps where no limit was set, despite filling three others with alternate rod configurations. Its apparent persistent candidate at 730.195 MHz was an intentionally blinded synthetic injection, not a discovery; two other persistent signals were attributed to radio interference after checks. The 2018 and 2019 reports have different author lists; the individual list shown for the later report is incomplete.

Reading status

This is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.

People and systems

N. Du; N. Force; R. Khatiwada; E. Lentz; R. Ottens; L. J. Rosenberg; G. Rybka; G. Carosi; N. Woollett; D. Bowring; A. S. Chou; A. Sonnenschein; W. Wester; C. Boutan; N. S. Oblath; R. Bradley; E. J. Daw; A. V. Dixit; J. Clarke; S. R. O’Kelley; N. Crisosto; J. R. Gleason; S. Jois; P. Sikivie; I. Stern; N. S. Sullivan; D. B. Tanner; G. C. Hilton; T. Braine; R. Cervantes

These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.

Original sources