8 research outputs found
Test of Hadronic Interaction Models in the Forward Region with KASCADE Event Rates
An analysis of muon and hadron rates observed in the central detector of the
KASCADE experiment has been carried out. The data are compared to CORSIKA
simulations employing the high-energy hadronic interaction models QGSJET,
DPMJET, HDPM, SIBYLL, and VENUS. In addition, first results with the new
hadronic interaction model neXus 2 are discussed. Differences of the model
predictions, both among each other and when confronted with measurements, are
observed. The hadron rates mainly depend on the inelastic cross-section and on
the contribution of diffraction dissociation. The discrepancy between
simulations and measurements at low primary energies around 5 TeV can be
reduced by increasing the non-diffractive part of the inelastic cross-section
of nucleon-air interactions. Examination of hadron multiplicities points
towards harder spectra of secondary pions and kaons needed in the calculations.Comment: 14 pages, 7 figures, corresponding author: M. Risse, accepted for
publication in J. Phys. G: Nucl. Part. Phy
Kneelike structure in the spectrum of the heavy component of cosmic rays observed with KASCADE-Grande
We report the observation of a steepening in the cosmic ray energy spectrum
of heavy primary particles at about eV. This structure is
also seen in the all-particle energy spectrum, but is less significant. Whereas
the `knee' of the cosmic ray spectrum at eV was assigned
to light primary masses by the KASCADE experiment, the new structure found by
the KASCADE-Grande experiment is caused by heavy primaries. The result is
obtained by independent measurements of the charged particle and muon
components of the secondary particles of extensive air showers in the primary
energy range of to eV. The data are analyzed on a
single-event basis taking into account also the correlation of the two
observables.Comment: 5 pages, 5 figures, accepted by PRL, published October, 7th, 201
All-particle energy spectrum of KASCADE-Grande based on shower size and different hadronic interaction models
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