2016/08/03 by P. Montini, S. M. Mari, Montini, P. +1
Physics and Astronomy · #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #High Energy Physics - Experiment (hep-ex) #astro-ph.HE #hep-ex
paper · pdf · doi:10.48550/arxiv.1608.01389
The paper has been withdrawn by the authors due to a crucial error in figure 4
arxiv created 2016/10/01 · arxiv updated 2016/10/04
The measurement of proton plus helium and all-particle energy spectra in the range 20 TeV to 5 PeV and 80 TeV to 5 PeV respectively are presented. Data taken by the ARGO-YBJ detector in the 2010 year have been analyzed. The ARGO-YBJ experiment (Tibet, P. R. China) has been taking data for more than five years by means of a full-coverage array of RPC detectors. The discrimination between showers produced by light and heavy primaries has been performed by looking at the lateral particle density close to the core region. A Bayesian unfolding technique was therefore applied to the measured quantities in order to evaluate the cosmic ray energy spectrum. The proton plus helium spectrum clearly shows a bending at about 1 PeV, while the all-particle spectrum is consistent with previous observations.