Source energy spectra of heavy cosmic ray nuclei as derived from the French-Danish experiment on HEAO-3

Details Source energy spectra of heavy cosmic ray nuclei as derived from the French-Danish experiment on HEAO-3 Source energy spectra of heavy cosmic ray nuclei as derived from the French-Danish experiment on HEAO-3

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...148...12e&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 148, no. 1, July 1985, p. 12-20.

Astronomy and Astrophysics

Astrophysics

39

Energy Spectra, Heao 3, Heavy Nuclei, Primary Cosmic Rays, Energetic Particles, High Energy Interactions, Particle Flux Density, Proton Flux Density, Radiation Sources

Scientific paper

Cosmic ray energy spectra have been derived using several spectra observed near the earth by the HEAO-3 spacecraft. The calculations were carried out within the framework of the leaky box model using values deduced from the secondary B/C and (Sc-Cr)/Fe ratios. The nuclei observed in the spectra included C, O, Ne, and Mg. Additional spectra were obtained for Si, Ca, and Fe nuclei. All the energy spectra were well fitted by a power law in momentum with an exponent equal to -2.41 + or - 0.005. Comparison with data obtained at higher energies showed a progressive flattening of the C + N + O spectrum in the TeV nucleon region. H and He source energy spectra were also derived by means of the leaky box method. The spectral index of 2.1 applies to the H spectrum at all energy levels from several TeV to a few GeV. No steepening was observed towards the lower energies. On the basis of the source energy spectra, it is suggested that a soft-component of heavy nuclei with a spectral index of about 2.7 is superposed to the common source spectrum of 2.1.

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