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30th International Cosmic Ray Conference

3-11 July 2007
Merida, Mexico
Mexico/General timezone
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Contribution Oral

Merida, Mexico - Yucatan II+III+IV (Fiesta Americana)
HE.3.1
HE 3.1

On the relation between the proton-air cross section and fluctuations of the shower longitudinal profile

Speakers

  • Dr. Ralph ENGEL

Primary authors

  • Mr. Ralf ULRICH (Forschungszentrum Karlsruhe, Karlsruhe Institute of Technology, 76021 Karlsruhe)

Co-authors

  • Prof. Johannes BLÜMER (Forschungszentrum Karlsruhe, Karlsruhe Institute of Technology, 76021 Karlsruhe)
  • Dr. Ralph ENGEL (Forschungszentrum Karlsruhe, Karlsruhe Institute of Technology, 76021 Karlsruhe)
  • Mr. Fabian SCHÜSSLER (Forschungszentrum Karlsruhe, Karlsruhe Institute of Technology, 76021 Karlsruhe)
  • Dr. Michael UNGER (Forschungszentrum Karlsruhe, Karlsruhe Institute of Technology, 76021 Karlsruhe)

Files

Abstract content

The current status and prospects of deducing the proton-air cross section from fluorescence telescope measurements of extensive air showers is discussed. As it is not possible to observe the point of first interaction, X_1, directly, other observables closely linked to X_1 must be inferred from the measured longitudinal profiles. This introduces a dependence on the models used to describe the shower development. We will discuss the sensitivity of the fluctuations of the shower profile on sigma_p-air. Systematic uncertainties arising from the model dependence, parameters of the reconstruction method itself and a possible non-proton contamination of the selected shower sample will be presented.

Reference

Proceedings of the 30th International Cosmic Ray Conference; Rogelio Caballero, Juan Carlos D'Olivo, Gustavo Medina-Tanco, Lukas Nellen, Federico A. Sánchez, José F. Valdés-Galicia (eds.); Universidad Nacional Autónoma de México, Mexico City, Mexico, 2008; Vol. 4 (HE part 1), pages 679-682