Abstract
Using data measured by the KASCADE-Grande air shower array, an upper limit to the flux of ultra-high energy gamma-rays in the primary cosmic-ray flux is determined. KASCADE-Grande measures the electromagnetic and muonic components for individual air showers in the energy range from 10 PeV up to 1 EeV. The analysis is performed by selecting air showers with low muon contents. A preliminary result on the 90% C.L. upper limit to the relative intensity of gamma-ray with respect to cosmic ray primaries is presented and compared with limits reported by other measurements.
Highlights
The flux of diffuse gamma rays and its spectrum is a very interesting topic in astrophysics
Extensive air showers are mainly characterized by the total electron number and the total muon number
The limits presented here represent the first results in the energy range above 5 × 1016 eV
Summary
The following full text is a publisher's version. For additional information about this publication click this link. http://hdl.handle.net/2066/150841. For additional information about this publication click this link. D Kang, W D Apel, J C Arteaga-Velazquez, K Bekk, M Bertaina, J Blumer, H Bozdog, I M Brancus, E Cantoni4,6,a, A Chiavassa, F Cossavella1,b, K Daumiller, V de Souza, F Di Pierro, P Doll, R Engel, Z Feng, D Fuhrmann9,c, A Gherghel-Lascu, H J Gils, R Glasstetter, C Grupen, A Haungs, D Heck, J R Horandel, D Huber, T Huege, K H Kampert, H O Klages, K Link, P Luczak, H J Mathes, H J Mayer, J Milke, B Mitrica, C Morello, J Oehlschlager, S Ostapchenko, N Palmieri, M Petcu, T Pierog, H Rebel, M Roth, H Schieler, S Schoo, F Schroder, O Sima, G Toma, G C Trinchero, H Ulrich, A Weindl, J Wochele, J Zabierowski
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