A study of the chemical composition of cosmic rays around 1018eV.

Details A study of the chemical composition of cosmic rays around 1018eV. A study of the chemical composition of cosmic rays around 1018eV.

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993comap..17..103g&link_type=abstract

Comments Astrophys., Vol. 17, No. 2 - 3, p. 103 - 117

Astronomy and Astrophysics

Astrophysics

2

Scientific paper

The authors compare the depth of maximum distribution of showers observed by the Fly's Eye detector with the results of detailed Monte Carlo calculations, including detector efficiency and reconstruction errors. The comparison shows that the cosmic ray composition in the region of 1018eV is quite heavy. Nuclei of mass > 20 comprise about 80% of the cosmic ray flux at ≡5×1017eV. At higher energy, the authors observe a light (H + He) component, characterized by a relatively flat energy spectrum, which is consistent with some models of acceleration of ultra-high energy cosmic rays, and which may signal the emergence of an extragalactic cosmic ray component.

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