The amplitude and phase of the cosmic-ray anisotropy are well established experimentally between 10(11) eV and 10(14) eV. The study of their evolution in the energy region 10(14)-10(16) eV can provide a significant tool for the understanding of the steepening ("knee") of the primary spectrum. In this Letter, we extend the EAS-TOP measurement performed at E-0 approximate to 10(14) eV to higher energies by using the full data set ( eight years of data taking). Results derived at about 10(14) and 4 x 10(14) eV are compared and discussed. Hints of increasing amplitude and change of phase above 10(14) eV are reported. The significance of the observation for the understanding of cosmic-ray propagation is discussed.

Evolution of the Cosmic-Ray anisotropy above 10(14) eV

BERGAMASCO, Laura Maria;BERTAINA, Mario Edoardo;BONINO, Raffaella;CHIAVASSA, Andrea;GALEOTTI, Piero;NAVARRA, Gianni Maria;SAAVEDRA, Oscar;VIGORITO, Carlo Francesco
2009

Abstract

The amplitude and phase of the cosmic-ray anisotropy are well established experimentally between 10(11) eV and 10(14) eV. The study of their evolution in the energy region 10(14)-10(16) eV can provide a significant tool for the understanding of the steepening ("knee") of the primary spectrum. In this Letter, we extend the EAS-TOP measurement performed at E-0 approximate to 10(14) eV to higher energies by using the full data set ( eight years of data taking). Results derived at about 10(14) and 4 x 10(14) eV are compared and discussed. Hints of increasing amplitude and change of phase above 10(14) eV are reported. The significance of the observation for the understanding of cosmic-ray propagation is discussed.
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L130
L133
M. Aglietta; V. V. Alekseenko; B. Alessandro; P. Antonioli; F. Arneodo; L. Bergamasco; M. Bertaina; R. Bonino; A. Castellina; A. Chiavassa; B. D. Piazzoli; G. Di Sciascio; W. Fulgione; P. Galeotti; P. L. Ghia; M. Iacovacci; G. Mannocchi; C. Morello; G. Navarra; O. Saavedra; A. Stamerra; G. C. Trinchero; S. Valchierotti; P. Vallania; S. Vernetto; C. Vigorito
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/57209
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