Abstract
The cosmic-ray spectrum has an intensity enhancement in the energy range 1014–1016 eV per nucleus1 (Fig. 1). Recent observations of heavy cosmic rays in this energy range indicate that the Ca/Fe ratio may be as large as 10 times the solar value. We suggest that pulsars in type-II supernova remnants are the origin of this component of the cosmic-ray spectrum.
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Takahashi, Y., Miyaji, S., Parnell, T. et al. Enhancement of high-energy cosmic-ray spectrum by type-II supernovae. Nature 321, 839–841 (1986). https://doi.org/10.1038/321839a0
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DOI: https://doi.org/10.1038/321839a0