The Energy Spectrum and the Chemical Composition of Primary Cosmic Rays with Energies from 1014 to 1016 eV

Details The Energy Spectrum and the Chemical Composition of Primary Cosmic Rays with Energies from 1014 to 1016 eV The Energy Spectrum and the Chemical Composition of Primary Cosmic Rays with Energies from 1014 to 1016 eV

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....1..131o&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

Scientific paper

We have measured extensive air showers(EASs) with primary energies above 6 TeV at Mt. Chacaltaya in Bolivia since March 2000 with an air shower array called the Minimum Air Shower(MAS) array. With an equi-intensity method analysis, we obtained longitudinal development curves of EAS around and deep er than their maximum developments to be compared with simulations, in which the primary chemical composition is assumed to be a mixture of protons and irons. We determined the mixing ratio of protons as a function of the primary energy, and we derived the primary energy spectrum from 1014 to 5 × 1016 eV. We found that the average mass number of primary cosmic rays increase with energy above 1014.5 eV and the dominant component around the knee is not protons.

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