Cosmic ray proton plus helium energy spectrum measured by the ARGO-YBJ experiment in the energy range 3-300 TeV
2015
The
ARGO-YBJ experiment is a full-coverage
air showerdetector located at the Yangbajing
Cosmic Ray Observatory(Tibet, People's Republic of China, 4300 m a.s.l.). The high altitude, combined with the full-coverage technique, allows the detection of extensive
air showersin a wide energy range and offer the possibility of measuring the
cosmic rayproton plus helium spectrum down to the TeV region, where direct balloon/space-borne measurements are available. The detector has been in stable data taking in its full configuration from November 2007 to February 2013. In this paper the measurement of the
cosmic rayproton plus helium energy spectrum is presented in the region 3-300 TeV by analyzing the full collected data sample. The resulting
spectral indexis $\gamma = -2.64 \pm 0.01$. These results demonstrate the possibility of performing an accurate measurement of the spectrum of light elements with a ground based
air showerdetector.
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