Direct search for solar axions by using strong magnetic field and X-ray detectors
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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.
11 pages, REVTeX, 4 eps figures included, submitted to PLB
11 pages, REVTeX, 4 eps figures included, submitted to PLB