On the chemical composition of cosmic rays of highest energy

Details On the chemical composition of cosmic rays of highest energy On the chemical composition of cosmic rays of highest energy

2010-06-09

arxiv.org/abs/1006.1781v5

J. Phys. G: Nucl. Part. Phys. 38 (2011) 085201

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

Version accepted by J.Phys. G (2011)

Scientific paper

10.1088/0954-3899/38/8/085201

We present arguments aiming at reconciling apparently contradictory results concerning the chemical composition of cosmic rays 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 nuclear composition of primary cosmic rays. They could also be caused by the change of distribution of the first interaction point in the cascade. A new observable, in which this influence is strongly suppressed, is proposed and tested.

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