Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....1..167t&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
Several observations on the electrons, muons and hadrons in air showers at energies ˜ 1015 eV have suggested that the primary cosmic ray flux may be getting enriched in heavier nuclei with increasing energy. This conclusion, though in conflict with some other observations, particularly, on the characteristics of the Cherenkov radiation in showers, has very significant implications for the nature of galactic sources generating and accelerating particles to ultra-high energies. We present here the results from the analysis of data on the muon multiplicity distributions from observations made with the large 192-mo dule 200 m2 area muon detector operating in association with the 100-detector air shower array of the GRAPES-2 experiment. Our observations also provide support to the hypothesis that the energy spectra for the heavier elements in the primary flux seems to be flatter relative to spectra for lighter nuclei at energies ˜ 1015 .
Gupta Kumar S.
Hayashi Yasuaki
Ito Nobuyasu
Jain Atul
John A. V.
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