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Abstract:
The sensitivity of the muon component for measurement of the
composition of primary cosmic ray flux at ultra-high energies,
$10^{14}-10^{16}$, has been known for a long time. Several
experiments have attempted to determine composition using small
or moderate size detectors for muons. Unfortunately, these
experiments have yielded ambiguous results. During the past few
years, we have attempted to study the muon component in air
showers with very large area detectors, for example, a 200 $m^2$
area detector in the GRAPES II experiment and a 560 $m^2$ area
detector in the GRAPES III experiment at the Institute's
mountain altitude (800 $g.cm^{-2}$) laboratory at Ooty in southern
India. The details of these two experiments and preliminary results
obtained from them would be presented at the meeting.
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