Remarks on the chemical composition of highest-energy cosmic rays

Details Remarks on the chemical composition of highest-energy cosmic rays Remarks on the chemical composition of highest-energy cosmic rays

2011-08-22

arxiv.org/abs/1108.4276v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

Presented at 32nd International Cosmic Ray Conference, Beijing 2011, to be published in conference materials

Scientific paper

We present arguments aiming to reconcile the apparently contradictory results concerning the chemical composition of cosmic rays of highest energy, coming recently from 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 nuclear composition of primary cosmic rays.

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