Chemical composition of primary cosmic rays with energies from 1015 to 1016.5 eV

Details Chemical composition of primary cosmic rays with energies from 1015 to 1016.5 eV Chemical composition of primary cosmic rays with energies from 1015 to 1016.5 eV

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aph....15..357s&link_type=abstract

Astroparticle Physics, Volume 15, Issue 4, p. 357-381.

Physics

11

Scientific paper

The chemical composition of primary cosmic rays with energies from 1015 to 1016.5 eV, so called ``knee'' region, is examined. We have observed the time structures of air Čerenkov light associated with air showers at Mt. Chacaltaya, Bolivia, since 1995. The distribution of a parameter that characterizes the observed time structures is compared with that calculated with a Monte Carlo technique for various chemical compositions. Then the energy dependence of the average logarithmic mass numbers of the primary cosmic rays is determined. The present result at 1015.3 eV is almost consistent with the result of JACEE (/A~=12) and shows gradual increase in as a function of the primary energy (/A~=24 at 1016 eV). Form the comparison of the observational results with several theoretical models, we conclude that the supernova explosion of massive stars is a plausible candidate for the origin of cosmic rays around the ``knee'' region.

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