Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for Solar Axions with the CDMS-II Experiment   The CDMS-II experiment operates 19 germanium detectors with a mass of 250g
each in a very low background environment. Originally designed for the search
for Dark Matter the experiment can also detect solar axions by Primakoff
conversion to photons. The Bragg condition for X-ray momentum transfer in a
crystal allows for coherent amplification of the Primakoff process. Since the
orientation of the crystal lattice with respect to the Sun changes with daytime
an unique pattern in time and energy of solar axion conversions is expected.
The low background ~1.5 counts/kg/day/keV and knowledge of the exact
orientation of all three crystal axes with respect to the Sun make the CDMS-II
experiment very sensitive to solar axions. In contrast to helioscopes, the high
mass region < 1 keV can also be probed effectively. The alternating
orientations of the individual crystals in the experimental setup provide
different patterns of solar axion conversion, making a false positive result
extremely unlikely. The result of an analysis of 289 kg-days of exposure
resulted in a null observation of solar axion conversion. This analysis sets an
upper limit on the axion photon coupling constant of g_{a\gamma\gamma} < 2.6 x
10^{-9} GeV{-1} at a 95% confidence level.

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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
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The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: cmp-lg
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The categories of this paper are: comp-gas
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The categories of this paper are: stat
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The categories of this paper are: hep-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: supr-con
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The categories of this paper are: nlin
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-ex