Recent results from the GRAPES-3 experiment
1 Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, 400005, India
2 The GRAPES-3 Experiment, Cosmic Ray Laboratory, Raj Bhavan, Ooty, 643001, India
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The GRAPES-3 is a dense extensive air shower array operating with ~400 scintillator detectors and a 560 m2 large tracking muon detector (Eμ > 1 GeV), at Ooty in India. The muon detector has been used to observe acceleration of muons during thunderstorm conditions. The muon multiplicity distribution of the EAS is used to probe the composition of primary cosmic rays below 1 PeV, with an overlap with direct measurements. More recently we have explored the possibility of using the angular distribution of >1 GeV muons to identify the best from among several low- and high-energy hadronic interaction models. We have major expansion plans to enhance the sensitivity of the GRAPES-3 experiment in all of the areas listed above.
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