Characteristics of high energy interactions I. High energy gamma-ray spectra near the top of the atmosphere |
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Authors: | R Hasan A K Agrawal M S Swami |
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Institution: | (1) Department of Physics, Aligarh Muslim University, 202 001 Aligarh |
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Abstract: | An emulsion chamber was used to study the characteristics of high energy nuclear interactions from the production spectra
ofγ-rays. The emulsion chamber, which comprised of two parts, namely the detector and the graphite producer unit, was exposed
to cosmic rays for about 7 hr at an atmospheric depth of 10 g cm−2 at Hyderabad (geomagnetic latitude 7·6°N). 720 electromagnetic cascades due toγ-rays were recorded in the detector. These cascades were classified into three groups; (a)γ-rays from nuclear interactions in the detector (b)γ-rays from nuclear interactions in the producer unit and (c)γ-rays of atmospheric origin. The energies of the cascades were determined using photometric method. The spectra ofγ-rays from groups (a) and (c) were determined and compared with similar spectra obtained at greater atmospheric depths. The
spectra were found to obey a power law. The spectrum ofγ-rays of atmospheric origin was found to steepen at high energies,E
r>2200 GeV. |
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Keywords: | Emulsion chamber atmosphericγ -rays collecting powers production rates steepening of theγ -ray spectrum |
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