A search for cosmic-ray acceleration by supernova remnant shocks

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Abstract
The debate concerning the manner in which cosmic rays are accelerated is a continuing one but shocks associated with supernova remnants (SNR) are strong theoretical favourites, at least at energies below 1014 eV. Experimental evidence is largely lacking, however, although evidence has been claimed for excesses of gamma-ray intensity and associated parent cosmic-ray particles associated with SNR, most particularly the prominent large remnant, Loop I. With the advent of the Compton Gamma Ray Observatory it is possible to check the hypothesis in two ways: by identifying gamma-ray excesses and by finding spectral changes as one crosses the SNR boundaries. The authors present the results of such a study which appears to give some support.

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