Direct measurements on cosmic ray protons through iron above about 1 TeV/amu have been performed in a series of balloon-borne experiments with emulsion chambers. The measured energy spectra of protons and helium are power laws with exponents of 2.77 + or - 0.09 and 2.72 + or - 0.11 in the energy range 5 to 500 TeV and 2 to 50 TeV/amu, respectively. The proton spectrum shows no evidence of the steepening near 2 TeV which was reported by other experiments. Helium has a slightly higher intensity compared to extrapolations from lower energy measurements. The heavier elements, carbon to sulfur, show a small tendency for intensity enhancement in the relative abundance obove 10 TeV/amu.


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    Title :

    Direct measurement of the composition and spectra of cosmic rays above 1 TeV/amu from JACEE


    Contributors:

    Published in:

    Publication date :

    1989-01-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English




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