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A new composition-sensitive parameter for Ultra-High Energy Cosmic Rays

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arxiv 1104.3399 v1 pith:EPPZEOID submitted 2011-04-18 astro-ph.HE astro-ph.IM

A new composition-sensitive parameter for Ultra-High Energy Cosmic Rays

G. Ros , A. D. Supanitsky , G. A. Medina-Tanco , L. del Peral , J. C. D'Olivo , M. D. Rodr\'iguez-Fr\'ias This is my paper
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keywords parametersarraysurfacebeencosmicdifferentenergyexperimental
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A new family of parameters intended for composition studies in cosmic ray surface array detectors is proposed. The application of this technique to different array layout designs has been analyzed. The parameters make exclusive use of surface data combining the information from the total signal at each triggered detector and the array geometry. They are sensitive to the combined effects of the different muon and electromagnetic components on the lateral distribution function of proton and iron initiated showers at any given primary energy. Analytical and numerical studies have been performed in order to assess the reliability, stability and optimization of these parameters. Experimental uncertainties, the underestimation of the muon component in the shower simulation codes, intrinsic fluctuations and reconstruction errors are considered and discussed in a quantitative way. The potential discrimination power of these parameters, under realistic experimental conditions, is compared on a simplified, albeit quantitative way, with that expected from other surface and fluorescence estimators.

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