Search for axioelectric effect of solar axions using BGO scintillating bolometer

A search for axioelectric absorption of solar axions produced in the $$p + d \rightarrow {^3\mathrm {He}}+\gamma (5.5~\mathrm {MeV})$$p+d→3He+γ(5.5MeV) reaction has been performed with a BGO detector placed in a low-background setup. A model-independent limit on the combination of axion–nucleon and axion–electron coupling constants has been obtained: $$| g_{Ae}\times g_{AN}^3|< 1.9\times 10^{-10}$$|gAe×gAN3|<1.9×10-10 for 90 % confidence level. The constraint of the axion–electron coupling constant has been obtained for hadronic axion with masses of (0.1–1) MeV: $$|g_{Ae}| \le (0.96 - 8.2)\times 10^{-8}$$|gAe|≤(0.96-8.2)×10-8.