Energy spectrum of cosmic protons and helium nuclei by ahybrid measurement at 4300 m a.s.l.

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B. Bartoli, P. Bernardini and X. J. Bi et al. Energy spectrum of cosmic protons and helium nuclei by ahybrid measurement at 4300 m a.s.l.[J]. Chinese Physics C, 2014, 38(4): 045001. doi: 10.1088/1674-1137/38/4/045001
B. Bartoli, P. Bernardini and X. J. Bi et al. Energy spectrum of cosmic protons and helium nuclei by ahybrid measurement at 4300 m a.s.l.[J]. Chinese Physics C, 2014, 38(4): 045001.  doi: 10.1088/1674-1137/38/4/045001 shu
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Received: 2014-01-29
Revised: 1900-01-01
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Energy spectrum of cosmic protons and helium nuclei by ahybrid measurement at 4300 m a.s.l.

Abstract: 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 (100-700 TeV). The observed energy spectrum is compatible with a single power law with index γ=-2.63±0.06.

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