Limits on the Isotropic gamma-ray / Cosmic ray Ratio in the Ultra High Energy region from the EAS Experiment at Ooty

Details Limits on the Isotropic gamma-ray / Cosmic ray Ratio in the Ultra High Energy region from the EAS Experiment at Ooty Limits on the Isotropic gamma-ray / Cosmic ray Ratio in the Ultra High Energy region from the EAS Experiment at Ooty

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icrc....4...85s&link_type=abstract

Proceedings of the 26th International Cosmic Ray Conference. August 17-25, 1999. Salt Lake City, Utah, USA. Under the auspices o

Physics

Scientific paper

We have attempted to determine the isotropic γ-ray / cosmic ray ratio using the very large area(560m2) muon detector operating with the EAS array at Ooty in southern India. The showers with their cores incident within the area of the EAS array but with no associated penetrating track in the muon detectors, classified as muon-poor showers, have been considered as primary γ-ray initiated shower candidates. We have obtained upper limits on the flux of isotropic γ-rays over the energy region from 50 TeV to 550 TeV. A conservative upper limit on the ratio, Iγ / ICR of 3*10-3 at 90% C.L., over the energy region, 200 TeV to 500 TeV, has been placed. 60

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