Abstract

A search for solar axions has been performed using an axion helioscope which is equipped with a 2.3m x 4T superconducting magnet, a gas container to hold dispersion-matching gas, PIN-photodiode X-ray detectors, and a telescope mount mechanism to track the sun. In the past measurements, axion up to 0.27eV have been scanned. It has been upgraded to handle dispersion-matching gas (He-4) of higher density to explore higher region. From December 2007 through April 2008, the axion region 0.84 < m < 1.00eV was newly explored, where the axions in the photon-coupling vs. mass parameter region of the preferred axion models were newly searched. From the absence of any evidence, a limit on axion-photon coupling constant was set to be g < 5.6-13.4e-10/GeV at 95% confidence level in the above region.

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