We present the first limit on gAγ coupling constant using the Bragg-Primakoff conversion based on an exposure of 1107.5 kg days of data from the CDEX-1B experiment at the China Jinping Underground Laboratory. The data are consistent with the null signal hypothesis, and no excess signals are observed. Limits of the coupling gAγ<2.08×10⁻⁹ GeV⁻¹ (95% C.L.) are derived for axions with mass up to 100 eV/c². Within the hadronic model of KSVZ, our results exclude axion mass >5.3~eV/c² at 95% C.L.
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Yang et al. (2024) studied this question.
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