12-20 July 2017
BEXCO
Asia/Seoul timezone
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Contribution

BEXCO - Room F(201/202/203/204)

[CRI029] Xmax reconstruction for EAS with energy above 10^16 eV from responses of tracking Cherenkov detectors

Speakers

  • Valentina MOKHNACHEVSKAYA

Primary authors

Co-authors

  • Yuriy EGOROV (Yu.G.Shafer Institute of Cosmophysical Research and Aeronomy SBRAS)
  • Ivan SLEPTSOV (Yu.G.Shafer Institute of Cosmophysical Research and Aeronomy SBRAS)
  • Zim PETROV (Yu.G.Shafer Institute of Cosmophysical Research and Aeronomy SBRAS)
  • Stanislav KNURENKO (Yu.G.Shafer Institute of Cosmophysical Research and Aeronomy SBRAS)

Description

This work describes the system of tracking detectors operating at the Yakutsk complex EAS array. A technique is given for calculation of number of photons arriving from different heights of the atmosphere from the detector response and, thus, to reconstruct the longitudinal development of individual showers. We present the results of direct observations of the cascade curve and give the depth of maximum shower development determined from the measurement of the Cherenkov emission from EAS. From the comparison between experimental values of xmax with simulation results based on the QGSJet-II-04 model for different primary particles, a preliminary conclusion was made on the cosmic rays mass composition in the energy range 10^16-10^18 eV.