Axion-proton coupling

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Basic plot

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Plot with projections

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Data files and references

Haloscopes

Note: CASPEr and nEDM limits account for stochastic correction reported in 1905.13650

• CASPEr-gradient: limit, reference
• CASPEr-wind: projection, reference
• CASPEr-ZULF-Comagnetometer: limit, reference
• CASPEr-ZULF-Sidechain: limit, projection, reference
• ChangE: limit, reference
• ChangE-NMR: limit, reference
• Mainz-Krakow (K-Rb-3He comagnetometers): limit, reference
• MnCO3: projection, reference
• NASDUCK: limit, reference
• NASDUCK (SERF): limit, reference
• Proton storage ring: projection, reference

Fifth force

• Casimir effect: limit, reference
• Torsion balance: limit, reference

Other experiments

• SNO solar axions: limit, reference
• Super-Kamiokande, diffuse supernova axions (at higher masses not shown): limit, reference

Astro bounds

• Astrophysical Black hole spins: limit, reference
• Neutron star cooling: limit, reference
• SN1987 Cooling+Events: limit, reference