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Direct search for solar axions by using strong magnetic field and X-ray detectors

Shigetaka Moriyama·Makoto Minowa·Toshio Namba·Yoshizumi Inoue·Yuko Takasu·Akira Yamamoto
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Abstract

We have searched for axions which could be produced in the solar core by exploiting their conversion to X rays in a strong laboratory magnetic field. The signature of the solar axion is an increase in the rate of the X rays detected in a magnetic helioscope when the sun is within its acceptance. From the absence of such a signal we set a 95% confidence level limit on the axion coupling to two photons $g_{aγγ}\equiv 1/M < 6.0\times 10^{-10}$ GeV$^{-1}$, provided the axion mass $m_a<0.03$ eV. The limit on the coupling is factor 4.5 more stringent than the recent experimental result. This is the first experiment whose sensitivity to $g_{aγγ}$ is higher than the limit constrained by the solar age consideration.

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Shigetaka Moriyama, Makoto Minowa, Toshio Namba, Yoshizumi Inoue, Yuko Takasu, Akira Yamamoto. 1998-05-22. Direct search for solar axions by using strong magnetic field and X-ray detectors. https://doi.org/10.1016/s0370-2693(98)00766-7

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