Abstract
Precise measurements of the nuclear composition and energy spectrum of primary cosmic rays at the ’knee’ and beyond are essential to understand their astrophysical origin, acceleration, and properties of the interstellar medium. The GRAPES-3 experiment located at Ooty in India is designed with a densely packed array of scintillator detectors. It measures cosmic rays from several TeV to over 10 PeV while providing a substantial overlap with direct experiments. The muon multiplicity distribution measured by the large area tracking muon detector associated with the array is sensitive to composition. Recently, we have attempted to measure the energy spectrum and composition from sub-TeV to over 10 PeV. The results obtained so far will be presented during the conference.
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