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Study of Markarian 421 in the γ-ray energy range 30–100 TeV

1999; Elsevier BV; Volume: 70; Issue: 1-3 Linguagem: Inglês

10.1016/s0920-5632(98)00484-8

1873-3832

P. L. Ghia, M. Aglietta, B. Alessandro, P. Antonioli, F. Arneodo, L. Bergamasco, М. Бертаина, C. Castagnoli, A. Castellina, A. Chiavassa, G. Cini Castagnoli, B. D′Ettorre Piazzoli, G. Di Sciascio, W. Fulgione, P. Galeotti, P. L. Ghia, M. Iacovacci, G. Mannocchi, C. Morello, G. Navarra, O. Saavedra, G. Trinchero, P. Vallania, S. Vernetto, C. Vigorito,

Dark Matter and Cosmic Phenomena

Extensive Air Showers at large zenith angles θ > 70° (Horizontal Air Showers, HAS) are observed at the EAS-TOP array at Campo Imperatore (Gran Sasso Laboratories). The rate of these events exceeds the one due to primary cosmic rays (at this angles) and therefore these showers have to be generated by penetrating particles. Assuming that they are produced by atmospheric muons we derived the muon flux as Fμ(> 30 TeV) = 1.1 × 10−11cm−2s−1sr−1, in good agreement with the underground measurements. The upper limits for diffuse neutrino radiation from these measurements is Iν(> 105GeV) < 1.5 times; 10−8cm−2s−1sr−1 for “all-flavour” neutrinos and dIνe (E0)/dEνe < 7.6 × 10−18cm−2s−1sr−1GeV−1, for the resonant (E0 = mW22me = 6.4 × 106GeV) neutrinos.