A Study of Nuclear Composition of Primary Cosmic Rays above 100 TeV

Details A Study of Nuclear Composition of Primary Cosmic Rays above 100 TeV A Study of Nuclear Composition of Primary Cosmic Rays above 100 TeV

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....1..155t&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 GRAPES-3 air shower array is located at Ooty (800g /cm2) in southern India and consists of 256 scintillation detectors (1m2 each) and 16 muon detectors (35m2 each). In order to study the nuclear composition of primary cosmic rays around the knee energy, we investigate the relation between muon multiplicity and shower size using observations from this experiment during the period, 20002001 with ˜ 106 showers having Ne > 105 . These results are compared with Monte Carlo simulations (CORSIKA v6.02 with QGSJET model) to obtain the variation of the average mass number with primary energy. We have carried out detailed simulations for five types of primary nucleus (Proton, He, N, Al and Fe) for comparison with observations. We present here the details of the results.

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