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 mass up to 0.27eV have been scanned. It has been upgraded to handle dispersion-matching gas (He-4) of higher density to explore higher mass region. From December 2007 through April 2008, the axion mass 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 mass region.
@article{arxiv.1002.0468,
title = {Tokyo axion helioscope experiment},
author = {Y. Inoue and Y. Akimoto and R. Ohta and T. Mizumoto and A. Yamamoto and M. Minowa},
journal= {arXiv preprint arXiv:1002.0468},
year = {2010}
}
Comments
5 pages, 4 figures. Identification of dark matter 2008 (idm2008), August 18-22, 2008, Stockholm, Sweden