Speaker
Dr
Stanislav Knurenko
(Yu. G. Shafer Institute of cosmophysical research and aeronomy, SB RAS)
Description
We present a new data on Cherenkov light observations obtained during 1994-2009 period,
after a modernization of the Yakutsk EAS array. A complex analysis of x_{max} and its
fluctuations \sigma(x_{max}) was performed in a wide energy range. With the new data,
accord-
ing to QGSJet II model, an estimation was made of cosmic rays mass composition for E_0
\sim 10^{17} - 3 \times 10^{19} eV. The result points towards a mixed composition with a
large portion of heavy nuclei at E_{0} \sim 10^{17} eV and the dominance of light nuclei
at E_{0} \sim 1019 eV. The analysis of \sigma(x_max) energy dependence for the same
energies qualitatively confirms this result. A shape of xmax distribution at fixed energy
1018 eV is analysed to make more precise conclusion on cosmic ray mass composition.
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Primary author
Dr
Stanislav Knurenko
(Yu. G. Shafer Institute of cosmophysical research and aeronomy, SB RAS)
Co-author
Mr
Artem Sabourov
(Yu. G. Shafer Institute of cosmophysical research and aeronomy, SB RAS)