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The cosmic ray energy spectrum between 10 and 10 eV |
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| Authors: | 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 |
| Institution: | a Dept. of Physics, The University of Michigan, Ann Arbor, MI 48109, USA b Enrico Fermi Institute, The University of Chicago, Chicago, IL 60637, USA c Dept. of Physics, The University of Utah, Salt Lake City, UT 84112, USA |
| 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?y) 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. |
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