Abstract 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 ± 0.09 and 2.72 ± 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 above 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:
    Parnell, T.A. (author) / Burnett, T.H. (author) / Dake, S. (author) / Derrickson, J.H. (author) / Fountain, W.F. (author) / Fuki, M. (author) / Gregory, J.C. (author) / Hayashi, T. (author) / Holynski, R. (author) / Iwai, J. (author)

    Published in:

    Publication date :

    1989-01-01


    Size :

    10 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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