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Search for solar axions via axion-photon coupling with the Majorana Demonstrator
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abstract
Axions were originally proposed to explain the strong-CP problem in QCD. Through the axion-photon coupling, the Sun could be a major source of axions, which could be measured in solid state detection experiments with enhancements due to coherent Primakoff-Bragg scattering. The Majorana Demonstrator experiment has searched for solar axions with a set of $^{76}$Ge-enriched high purity germanium detectors using a 33 kg-yr exposure collected between Jan. 2017 and Nov. 2019. A temporal-energy analysis gives a new limit on the axion-photon coupling as $g_{a\gamma}<1.45\times 10^{-9}$ GeV$^{-1}$ (95% C.I.) for axions with mass up to 100 eV/$c^2$. This improves laboratory-based limits between about 1 eV/$c^2$ and 100 eV/$c^2$.
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Cited by 1 Pith paper
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First Experimental Bounds on Transverse Plasmon Solar Axions with ANAIS-112
ANAIS-112 found no annual modulation from solar axions produced by resonant transverse-plasmon conversion, setting a 90% C.L. limit gaγ<1.32e-9 GeV^-1 at ma≈150 eV.
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