Upper Limit on the Diffuse Gamma Ray Flux Using Air Shower Observations at Ooty

Details Upper Limit on the Diffuse Gamma Ray Flux Using Air Shower Observations at Ooty Upper Limit on the Diffuse Gamma Ray Flux Using Air Shower Observations at Ooty

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....4.2273h&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

We have attempted to determine diffuse gamma ray flux using very large area (560m2 ) and compact muon detectors operating with GRAPES-3 air shower array. The showers with their cores incident within the EAS array but with no associated penetrating track in the muon detectors are classified as muon-p o or showers. These are considered candidates for gamma ray initiated showers. We have obtained upper limits on the flux of isotropic gamma rays over the energy region from 20 TeV to 500 TeV. A conservative upper limit on the ratio, Iγ /IC R of 3 × 10-4 at 90% C.L., over the energy region, 100 TeV to 500 TeV, has been placed.

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