Abstract
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: $|g_{Ae}| \leq (1.4 - 9.7)\times 10^{-7}$.
Highlights
The axion is a pseudo-Goldstone boson arising from breaking the global Peccei-Quinn (PQ) symmetry [1,2,3]
The measurements were performed over 29.8 days in live time by 2-hour series
The measurements were divided into series in order to monitor the time stability of the BGO detector and the active shielding
Summary
The axion is a pseudo-Goldstone boson arising from breaking the global Peccei-Quinn (PQ) symmetry [1,2,3]. The original so-called Weinberg–Wilczek–Peccei–Quinn axion model contained some certain direct predictions for the coupling constants between axions and photons (gAγ ), electrons (gAe) and nucleons (gAN ) as well as for the axion mass (mA). This model was quickly disproved by the reactor and accelerator experiments [4]. The particle has been retained by two new theoretical models of the “invisible” axion in the form required to solve the CP problem of strong interactions; at the same time its interaction with matter is suppressed. The scale of Peccei–Quinn symmetry violation is arbitrary in both models and can be extended up to the Planck mass ≈1019 GeV
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