EAS-TOP: The proton-air inelastic cross-section at √s ≈ 2 TeV

M. Aglietta, B. Alessandro, P. Antonioli, F. Arneodo, L. Bergamasco, M. Bertaina, E. Cantoni, A. Castellina, A. Chiavassa, B. D'ettorre Piazzoli, G. Di Sciascio, W. Fulgione, P. Galeotti, P. L. Ghia, A. Lima De Godoi, M. Iacovacci, G. Mannocchi, C. Morello, G. Navarra, O. SaavedraG. C. Trinchero, S. Valchierotti, P. Vallania, S. Vernetto, C. Vigorito

Research output: Contribution to conferencePaperpeer-review


The proton-air inelastic cross section measurement at √s ≈ 2 TeV from the EAS-TOP Extensive Air Shower experiment is reported. The technique exploits cosmic ray proton primaries in the energy region E0 = (1.5 ÷ 2.5) 1015 eV, studying the absorption length of their cascades when detected at maximum development. Primary energies are selected through the EAS muon number (Nμ), and proton originated cascades at maximum development by means of the shower size (Ne). The shower longitudinal development and detection fluctuations are determined by means of simulations performed using the CORSIKA code and the QGSJET interaction model. The simulations provide the conversion factor (k=1.15±0.05) from the observed attenuation length (λobsexp =76.0±3.8 g/cm2) to the interaction length (λp-airintexp =66.1±4.4 g/cm2). The obtained value of the p-air inelastic cross section at √s ≈ 2 TeV is σp-airinel =365±24(stat)-28(sys) mb. The statistical and systematic uncertainties, as well as the connections with the pp total cross section measurements are discussed.

Original languageEnglish (US)
Number of pages4
StatePublished - 2007
Event30th International Cosmic Ray Conference, ICRC 2007 - Merida, Yucatan, Mexico
Duration: Jul 3 2007Jul 11 2007


Other30th International Cosmic Ray Conference, ICRC 2007
CityMerida, Yucatan

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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