On the chemical composition of cosmic rays of highest energy

@article{Wilk2011OnTC,
  title={On the chemical composition of cosmic rays of highest energy},
  author={Grzegorz Wilk and Zbigniew Włodarczyk},
  journal={Journal of Physics G},
  year={2011},
  volume={38},
  pages={085201}
}
We present arguments aiming at reconciling apparently contradictory results concerning the chemical composition of cosmic rays (CRs) of highest energy, coming recently from the Auger and HiRes collaborations. In particular, we argue that the energy dependence of the mean value and root mean square fluctuation of shower maxima distributions observed by the Auger experiment are not necessarily caused by the change of the nuclear composition of primary CRs. They could also be caused by the change… Expand

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References

SHOWING 1-10 OF 18 REFERENCES
Energy dependence of inelasticity from high-energy cosmic ray reactions
The authors point out the possible correlation between inelasticity and cross section emerging from the analysis of different cosmic ray experiments. This correlation could be used for theExpand
Percolation effects in very-high-energy cosmic rays.
TLDR
This Letter argues that percolation effects in the description of the shower development cause a change in the behavior of the inelasticity K above E approximately 10(17) eV, which can be accounted for in models predicting that above a certain energy showers would develop deeper in the atmosphere. Expand
Indications of proton-dominated cosmic-ray composition above 1.6 EeV.
TLDR
These measurements constrain models in which the galactic-to-extragalactic transition is the cause of the energy spectrum ankle at 4x10(18) eV, and are consistent with a predominantly protonic composition of cosmic rays when interpreted via the Q GSJET01 and QGSJET-II high-energy hadronic interaction models. Expand
Composition Studies with the Pierre Auger Observatory
We report on studies of the composition of ultra high energy cosmic rays with the Pierre Auger Observatory. The detection of longitudinal air shower profiles with the fluorescence detector isExpand
Gluon saturation effects at the nuclear surface: Inelastic cross section of proton–nucleus in the ultra-high-energy cosmic ray domain
Abstract Considering the high-energy limit of the QCD gluon distribution inside a nucleus, we calculate the proton–nucleus total inelastic cross section using a simplified dipole model. We show that,Expand
Validity of Scaling to 10 20 eV and High-Energy Cosmic-Ray Composition
It is shown that evidence on cosmic-ray showers of energy 3 x 10/sup 16/ to 10/sup 20/ eV indicates that scaling in the fragmentation region is valid up to the highest energies if (and only if)Expand
Hadronic multiparticle production at ultrahigh energies and extensive air showers
Studies of the nature of cosmic ray particles at the highest energies are based on the measurement of extensive air showers. Most cosmic ray properties can therefore be obtained only from theExpand
QGSJET-II: Towards reliable description of very high energy hadronic interactions
Since a number of years the QGSJET model has been successfully used by different groups in the field of high energy cosmic rays. Current work is devoted to the first general update of the model. TheExpand
Hybrid simulations of extensive air showers
We present a fast one dimensional hybrid method to efficiently simulate extensive air showers up to the highest observed energies. Based on precalculated pion showers and a bootstrap technique, ourExpand
Energy dependence of inelasticity as seen by cosmic rays
The author presents the status of inelasticity in high-energy hadronic reactions. In particular, the author elucidates some points concerning the energy dependence of inelasticity emerging fromExpand
...
1
2
...