The proton-air inelastic cross section (sigma(inel)(p-air)) is measured at root s approximate to 2 TeV 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 E-0 = (1.5 divided by 2.5) 10(15) eV, are selected through the EAS muon number (N-mu), and proton originated cascades at maximum development are selected by means of the shower size (N-e). The observed absorption length (lambda(obs)) is a convolution of the proton-air interaction length (lambda(p-air)) and of the shower and detector fluctuations. The conversion factor k = lambda(obs)/lambda(int) 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 root s approximate to 2 TeV is sigma(inel)(p-air) = 338 +/- 21(stat) +/- 19(syst) - 28(syst) mb. The statistical and systematic uncertainties, as well as the relationships with the pp ((p) over barp) total cross section measurements are discussed.

Measurement of the proton-air inelastic cross section at root s approximate to 2 Tev from the EAS-TOP experiment

BERGAMASCO, Laura Maria;BERTAINA, Mario Edoardo;CANTONI, Elena Carla;CHIAVASSA, Andrea;GALEOTTI, Piero;NAVARRA, Gianni Maria;SAAVEDRA, Oscar;VIGORITO, Carlo Francesco
2009

Abstract

The proton-air inelastic cross section (sigma(inel)(p-air)) is measured at root s approximate to 2 TeV 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 E-0 = (1.5 divided by 2.5) 10(15) eV, are selected through the EAS muon number (N-mu), and proton originated cascades at maximum development are selected by means of the shower size (N-e). The observed absorption length (lambda(obs)) is a convolution of the proton-air interaction length (lambda(p-air)) and of the shower and detector fluctuations. The conversion factor k = lambda(obs)/lambda(int) 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 root s approximate to 2 TeV is sigma(inel)(p-air) = 338 +/- 21(stat) +/- 19(syst) - 28(syst) mb. The statistical and systematic uncertainties, as well as the relationships with the pp ((p) over barp) total cross section measurements are discussed.
PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY
79
032004
-
cosmic rays; proton-air cross section; interaction models; nuclear physics
M. Aglietta; B. Alessandro; P. Antonioli; F. Arneodo; L. Bergamasco; M. Bertaina; A. Castellina; E. Cantoni; A. Chiavassa; B. D. Piazzoli; G. D. Sciascio; W. Fulgione; P. Galeotti; P. L. Ghia; M. Iacovacci; G. Mannocchi; C. Morello; G. Navarra; O. Saavedra; A. Stamerra; G. C. Trinchero; P. Vallania; S. Vernetto; C. Vigorito
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/77886
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