http://arxiv.org/abs/1401.6987
The energy spectrum of cosmic Hydrogen and Helium nuclei has been measured, below the so-called “knee”, by using a hybrid experiment with a wide field-of-view Cherenkov telescope and the Resistive Plate Chamber (RPC) array of the ARGO-YBJ experiment at 4300 m above sea level. The Hydrogen and Helium nuclei have been well separated from other cosmic ray components by using a multi-parameter technique. A highly uniform energy resolution of about 25% is achieved throughout the whole energy range (100 TeV – 700 TeV). The observed energy spectrum is compatible with a single power law with index gamma=-2.63+/-0.06.
Tue, 28 Jan 14
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