The Cosmic Ray Primary Composition in the Knee Region through the EAS Electromagnetic and Muon Measurements at EAS-TOP

Details The Cosmic Ray Primary Composition in the Knee Region through the EAS Electromagnetic and Muon Measurements at EAS-TOP The Cosmic Ray Primary Composition in the Knee Region through the EAS Electromagnetic and Muon Measurements at EAS-TOP

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....1..151v&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

The evolution of the cosmic ray primary composition in the energy range 10 ÷ 1016 eV (i.e. the "knee" region) is studied by means of the e.m. and 15 muon data of the Extensive Air Shower EAS-TOP array. The measurement is performed by analyzing the whole distributions of the detected muon numbers vs. the shower size in terms of three mass groups: lig ht (p,He), inter mediate (CNO), and heav y (Fe). In the "knee" region the obtained evolution of the energy spectra leads to a steep spectrum of the lig ht mass group (γp,H e > 3.1), a possible break of the inter mediate one or a spectrum on the average harder than for the 2.75), and a constant slope for the spectrum of the lig ht mass group (γC N O heav y primaries (γF e 2.3 ÷ 2.7) consistent with the direct measurements. With increasing energy, the average primary mass changes from < lnA >= 1.6 ÷ 1.9 at E0 1.5 · 1015 eV to < lnA >= 2.8 ÷ 3.1 at E0 1 · 1016 eV. The result supports the standard acceleration and propagation models of galactic cosmic rays that predict rigidity dependent cut-offs for the primary spectra of the different nuclei.

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