Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ap%26ss.115..163g&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 115, no. 1, Oct. 1985, p. 163-183.
Astronomy and Astrophysics
Astronomy
10
Cerenkov Counters, Cosmic Ray Showers, Gamma Ray Astronomy, Gamma Ray Telescopes, High Energy Interactions, Parabolic Reflectors, Apertures, Background Noise, Design Analysis, Electron Photon Cascades, Energy Spectra, Photomultiplier Tubes, Quantum Efficiency, Signal To Noise Ratios
Scientific paper
Detection of cosmic sources of very high energy gamma rays based on the atmospheric Cerenkov technique is discussed. On entering the earth's atmosphere, such gamma rays initiate electron-photon cascade showers which in turn produce Cerenkov photons in the air. Parabolic reflectors, deployed either compactly or spread out, are used to focus these photons onto fast photomultipliers. The relative superiority of each type of array depends on the exponent assumed for the differential power law energy spectrum for the gamma ray source. With the type of reflectors commonly used in atmospheric Cerenkov work, lower energy thresholds can be achieved by using larger apertures.
Gupta Kumar S.
Ramana Murthy P. V.
Tonwar Suresh C.
Vishwanath P. R.
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