Physics
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009phrvd..79c2004a&link_type=abstract
Physical Review D, vol. 79, Issue 3, id. 032004
Physics
6
Cosmic-Ray Interactions, Extensive Air Showers
Scientific paper
The proton-air inelastic cross section (σp-airinel) is measured at s≈2TeV at the EAS-TOP extensive air shower experiment by studying the absorption length of cosmic ray proton primaries cascades reaching the maximum development at the observation level. Primary energies, in the region E0=(1.5÷2.5)·1015eV, are selected through the EAS muon number (Nμ), and proton originated cascades at maximum development are selected by means of the shower size (Ne). The observed absorption length (λobs) is a convolution of the proton-air interaction length (λp-air) and of the shower and detector fluctuations. The conversion factor k=λobs/λint is obtained by means of simulations performed with the CORSIKA code and the QGSJET II and SIBYLL interaction models. The obtained value of the p-air inelastic cross section at s≈2TeV is σp-airinel=338±21(stat)±19(syst)-28(syst)mb. The statistical and systematic uncertainties, as well as the relationships with the pp (p¯p) total cross section measurements are discussed.
Aglietta Marco
Alessandro Bemporad
Antonioli Pietro
Arneodo F.
Bergamasco L.
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