The cosmic ray energy spectrum between 1014 and 1016 eV

M. A.K. Glasmacher, M. A. Catanese, M. C. Chantell, C. E. Covault, J. W. Cronin, B. E. Fick, L. F. Fortson, J. W. Fowler, K. D. Green, D. B. Kieda, J. Matthews, B. J. Newport, D. F. Nitz, R. A. Ong, S. Oser, D. Sinclair, J. C. Van Der Velde

Research output: Contribution to journalArticlepeer-review

108 Scopus citations

Abstract

The energy spectrum of cosmic rays with primary energies between 1014 eV and 1016 eV has been studied with the CASA-MIA air shower array. The measured differential energy spectrum is a power law (dj/dE ∝ E) with spectral indices γ of 2.66 ± 0.02 below approximately 1015 eV and 3.00 ± 0.05 above. A new method is used for measuring primary energy derived from ground-based data in a compositionally insensitive way. In contrast with some previous reports, the "knee" of the energy spectrum does not appear sharp, but rather a smooth transition over energies from 1015 eV to 3.0 × 1015 eV.

Original languageEnglish (US)
Pages (from-to)291-302
Number of pages12
JournalAstroparticle Physics
Volume10
Issue number4
DOIs
StatePublished - May 1999

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