Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cosmic Ray Antiprotons from Nearby Cosmic Accelerators   The antiproton flux measured by PAMELA experiment might have originated from
Galactic sources of cosmic rays. These antiprotons are expected to be produced
in the interactions of cosmic ray protons and nuclei with cold protons. Gamma
rays are also produced in similar interactions inside some of the cosmic
acceleratos. We consider a few nearby supernova remnants observed by Fermi LAT.
Many of them are associated with molecular clouds. Gamma rays have been
detected from these sources which most likely originate in decay of neutral
pions produced in hadronic interactions. The observed gamma ray fluxes from
these SNRs are used to find out their contributions to the observed diffuse
cosmic ray antiproton flux near the earth.

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The categories of this paper are: q-alg
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The categories of this paper are: cond-mat
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The categories of this paper are: stat
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
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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: chao-dyn
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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
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The categories of this paper are: supr-con
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ph