The cosmic ray energy spectrum between 1014 and 1016 eV
Document Type
Article
Publication Date
7-1-1999
Department
Department of Physics
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-γ) 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.
Publication Title
Astroparticle Physics
Recommended Citation
Glasmacher, M.,
Catanese, M.,
Chantell, M.,
Covault, C.,
Cronin, J.,
Fick, B.,
Newport, B.,
Nitz, D.,
&
et al.
(1999).
The cosmic ray energy spectrum between 1014 and 1016 eV.
Astroparticle Physics,
10(4), 291-302.
http://doi.org/10.1016/S0927-6505(98)00070-X
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/7623