Search for axioelectric effect of 5.5 MeV solar axions using BGO detectors

A search for axioelectric absorption of solar axions produced in the $p + d \rightarrow{^{3}\rm{He}}+\gamma~(5.5~\rm{MeV})$ reactions has been performed with a BGO detector placed in a low-background setup. A model-independent limit on an axion-nucleon and axion–electron coupling constant has been obtained: $| g_{Ae}\times g_{AN}^{3}|< 2.9\times 10^{-9}$ for 90 % confidence level. The constrains of the axion–electron coupling have been obtained for hadronic axion with masses in (0.1–1) MeV range: |gAe|≤(1.4–9.7)×10−7.