Search for sub-electronvolt solar axions using coherent conversion of   axions into photons in magnetic field and gas helium
  A search for solar axions has been performed using an axion helioscope which is equipped with a 2.3m-long 4T superconducting magnet, PIN-photodiode X-ray detectors, and a telescope mount mechanism to track the sun. In addition, a gas container to hold dispersion-matching gas has been developed and a mass region up to m_a=0.27eV was newly explored. From the absence of any evidence, analysis sets a limit on axion-photon coupling constant to be $g_{a\gamma\gamma}<6.8-10.9\times10^{-10}GeV^{-1}$ for the axion mass of 0.05<m_a<0.27eV at 95% confidence level, which is more stringent than the limit inferred from the solar-age consideration. This result gives currently the most stringent observational limit on the existence of solar axions in this mass region. 
Y. Inoue, T. Namba, S. Moriyama, M. Minowa, Y. Takasu, T. Horiuchi, A.   Yamamoto