Constraints on the axion-electron coupling for solar axions produced by Compton process and bremsstrahlung

Abstract

The search for solar axions produced by Compton ($\gamma +e^{-}\to e^{-}+A$) and bremsstrahlung-like ($e^{-}+Z\to Z+e^{-}+A$) processes has been performed. The axion flux in the both cases depends on the axion-electron coupling constant. The resonant excitation of low-lying nuclear level of ${}^{169}\mathrm{Tm}$ was looked for: $A{+}^{169}$Tm ${\to }^{169}$Tm${}^{\ast }$ ${\to }^{169}$Tm $+\gamma$ (8.41 keV). The Si(Li) detector and ${}^{169}$Tm target installed inside the low-background setup were used to detect 8.41 keV $\gamma$-rays. As a result, a new model independent restriction on the axion-electron and the axion-nucleon couplings was obtained: $g_{Ae}\times |g_{AN}^0+g_{AN}^3|\le 2.1\times 10^{-14}$. In model of hadronic axion this restriction corresponds to the upper limit on the axion-electron coupling and on the axion mass $g_{Ae}\times m_A\le 3.1\times 10^{-7}$ eV (90% c.l.). The limits on axion mass are $m_A\le$ 105 eV and $m_A\le$ 1.3 keV for DFSZ- and KSVZ-axion models, correspondingly (90% c.l.).

7 pages, 4 figures

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