Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Finding the boson-number distributions in superconductors from photon
  spectra emitted by supercurrent-carrying rings irradiated with far IR fields   A theory of the IR-field-induced single-photon generation by the narrow
thin-film superconducting rings made of the isotropic s-wave pairing type-II
superconductors is presented. It is shown that statistical measurements of the
energies of photons emitted by the same current-carrying ring prepared
initially in the same quantum state, allow to find the number distribution of
Cooper pairs in the superconductor.

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The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc