Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Precursor of Chiral Symmetry Restoration in the Nuclear Medium   Spectral enhancement near the 2m_{\pi} threshold in the I=J=0 channel in
nuclei is shown to be a distinct signal of the partial restoration of chiral
symmetry. The relevance of this phenomenon with the possible detection of
2\pi^{0} and 2\gamma in hadron-nucleus and photo-nucleus reactions is
discussed.

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The categories of this paper are: cond-mat
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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
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The categories of this paper are: eess
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The categories of this paper are: hep-th
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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: hep-lat
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The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
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The categories of this paper are: stat
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The categories of this paper are: comp-gas
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The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph