Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....1..159t&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
1
Scientific paper
For a study of the chemical composition at the Knee region, we have measured lateral distributions both of air Cherenkov photons and of charged particles simultaneously at Mt. Chacaltaya in Bolivia since August 2001. The measured lateral distributions of air Cherenkov photons were fitted with an empirical function which includes a parameter reflecting mass numbers of primary cosmic rays. The observed distributions of this parameter were compared with those simulated using the CORSIKA code with the QGSJET hadronic interaction model for three species of primary cosmic rays: proton, C, Fe. As a result, the mean logarithmic mass number of primary cosmic rays ln A in the energy range from 1014 to 1016 eV was determined. The result shows that ln A decreases in the range from 1014.1 to 1014.7 eV and increases from 1014.7 to 1015.8 eV.
BASJE Collaboration
Harada Daisuke
Kakimoto Fumio
Kurashina Y.
Matsubara Yoshimi
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