Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theory for the Direct Detection of Solar Axions by Coherent Primakoff
  Conversion in Germanium Detectors   It is assumed that axions exist and are created in the Sun by Primakoff
conversion of photons in the Coulomb fields of nuclei. Detection rates are
calculated in germanium detectors due to the coherent conversion of axions to
photons in the lattice when the incident angle fulfills the Bragg condition for
a given crystalline plane. The rates are correlated with the relative positions
of the Sun and detector, yielding a characteristic recognizable sub-diurnal
temporal pattern. A major experiment is proposed based on a large detector
array.

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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: hep-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
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The categories of this paper are: funct-an
3
The categories of this paper are: physics
2
The categories of this paper are: math
16
The categories of this paper are: stat
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The categories of this paper are: atom-ph
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The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc