A New Measurement on the Energy Spectrum of Primary Cosmic Rays in the Energy Region 1014-1016eV, with GRAPES-3 Experiment

Details A New Measurement on the Energy Spectrum of Primary Cosmic Rays in the Energy Region 1014-1016eV, with GRAPES-3 Experiment A New Measurement on the Energy Spectrum of Primary Cosmic Rays in the Energy Region 1014-1016eV, with GRAPES-3 Experiment

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....1..171g&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 extensive air shower (EAS) array consists of 256 densely packed unshielded `electron' detectors with inter-detector spacing of only 8 m. The array configuration is hexagonally symmetric. Showers collected during the period, 2000-2002, with a simple trigger requiring only a 3-fold coincidence between signals from detectors from 3 nearby rows, have been analysed for various shower parameters. A shower size spectrum has been constructed using this large data base over the shower size range, 105 -107 . The spectral steep ening is clearly seen at shower size ˜6×105 particles corresponding to primary energy ˜3×1015 eV. Results from detailed Monte Carlo simulations have been used to convert the observed size spectrum to primary cosmic ray energy spectrum. We present here details of the experiment, analysis procedure and the energy spectrum for various assumed models for primary composition at energies ˜1015 eV.

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