Probing high-energy solar axion flux with a large scintillation neutrino detector

Abstract

We investigate the 5.49 MeV solar axions flux produced in the $p(d,{}^3\mathrm{He})a$ reaction and analyze the potential to detect it with the forthcoming large underground neutrino oscillation experiment Jiangmen Underground Neutrino Observatory (JUNO). The JUNO detector could reveal axions through various processes such as Compton and inverse Primakoff conversion, as well as through their decay into two photons or electron-positron pairs inside the detector. We perform a detailed numerical analysis in order to forecast the sensitivity on different combinations of the axion-electron ($g_{ae}$), axion-photon ($g_{a\gamma }$), and isovector axion-nucleon ($g_{3aN}$) couplings, using the expected JUNO data for different benchmark values of axion mass in a model-independent way. We find that JUNO would improve by approximately one order of magnitude current bounds by Borexino and it has the best sensitivity among neutrino experiments.

21 pages, 7 figures

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