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Recently, the gamma‐ray telescopes AGILE and Fermi observed several middle‐aged supernova remnants (SNRs) interacting with molecular clouds. It is likely that their gamma‐rays arise from the decay of neutral pions produced by the inelastic collision between cosmic rays (CRs) and nucleons, which suggests that SNRs make the bulk of Galactic CRs. In this paper, we provide the analytical solution of the...
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