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Energy Spectrum and Mass Composition of Cosmic Ray Nuclei from 1012 to 1020eV

  • Conference paper
Origin of Cosmic Rays

Part of the book series: NATO Advanced Study Institutes Series ((ASIC,volume 14))

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Abstract

A view of the cosmic ray energy spectrum above 1012eV which has been popular during the last ten years is one in which the spectral index above 1012eV changes fairly sharply every 3 decades in energy. Between 1012 and 1015eV the primary intensity was believed to fall with an integral exponent of −1.6; from 1015 to 1018eV the fall became significantly steeper (exponent = −2.2) but above 1018eV the, earlier, gentler, slope was resumed. It was often held that the steepening above 1015eV was associated with an enrichment of heavy nuclei in the cosmic ray beam consequent upon the onset of leakage of protons from the galaxy, while the feature at 1018eV has been associated with the appearance of extragalactic particles, probably protons, as the dominant component in the primary flux.

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  1. Department of Physics, University of Leeds, Leeds 2, UK

    A. A. Watson

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  1. Physics Department, University of Durham, Durham, England

    J. L. Osborne  & A. W. Wolfendale  & 

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Watson, A.A. (1975). Energy Spectrum and Mass Composition of Cosmic Ray Nuclei from 1012 to 1020eV. In: Osborne, J.L., Wolfendale, A.W. (eds) Origin of Cosmic Rays. NATO Advanced Study Institutes Series, vol 14. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-1812-8_5

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  • DOI: https://doi.org/10.1007/978-94-010-1812-8_5

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