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The Knee of the Cosmic Hydrogen and Helium Spectrum below 1 PeV Measured by ARGO-YBJ and a Cherenkov Telescope of LHAASO

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arxiv 1502.03164 v1 pith:6HH5RZSC submitted 2015-02-11 astro-ph.HE hep-ex

The Knee of the Cosmic Hydrogen and Helium Spectrum below 1 PeV Measured by ARGO-YBJ and a Cherenkov Telescope of LHAASO

B. Bartoli , P. Bernardini , X.J. Bi , P. Branchini , A. Budano , P. Camarri , Z. Cao , R. Cardarelli
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S. Catalanotti S.Z. Chen T.L. Chen P. Creti S.W. Cui B.Z. Dai A. D'Amone Danzengluobu I. De Mitri B. D'Ettorre Piazzoli T. Di Girolamo G. Di Sciascio C.F. Feng Zhaoyang Feng Zhenyong Feng Q.B. Gou Y.Q. Guo H.H. He Haibing Hu Hongbo Hu M. Iacovacci R. Iuppa H.Y. Jia Labaciren H.J. Li G. Liguori C. Liu J. Liu M.Y. Liu H. Lu L.L. Ma X.H. Ma G. Mancarella S.M. Mari G. Marsella D. Martello S. Mastroianni P. Montini C.C. Ning M. Panareo L. Perrone P. Pistilli F. Ruggieri P. Salvini R. Santonico P.R. Shen X.D. Sheng F. Shi A. Surdo Y.H. Tan P. Vallania S. Vernetto C. Vigorito H. Wang C.Y. Wu H.R. Wu L. Xue Q.Y. Yang X.C. Yang Z.G. Yao A.F. Yuan M. Zha H.M. Zhang L. Zhang X.Y. Zhang Y. Zhang J. Zhao Zhaxiciren Zhaxisangzhu X.X. Zhou F.R. Zhu Q.Q. Zhu G. Zizzi (ARGO-YBJ Collaboration) Y.X. Bai M.J. Chen Y. Chen S.H. Feng B. Gao M.H. Gu C. Hou X.X. Li J.L. Liu X. Wang G. Xiao B.K. Zhang S.S. Zhang B. Zhou X. Zuo (LHAASO Collaboration)
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classification astro-ph.HE hep-ex
keywords cosmicspectrumapproachargo-ybjcherenkovexperimentheliumhydrogen
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The measurement of cosmic ray energy spectra, in particular for individual species, is an essential approach in finding their origin. Locating the "knees" of the spectra is an important part of the approach and has yet to be achieved. Here we report a measurement of the mixed Hydrogen and Helium spectrum using the combination of the ARGO-YBJ experiment and of a prototype Cherenkov telescope for the LHAASO experiment. A knee feature at 640+/-87 TeV, with a clear steepening of the spectrum, is observed. This gives fundamental inputs to galactic cosmic ray acceleration models.

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