Primary Energy Spectrum and Mass Composition Determined with the Tunka   EAS Cherenkov Array
  New results of 300 hours of operation of the Tunka array are presented.   An improved parametrization of the Cherenkov light lateral distribution function (LDF), based on CORSIKA Monte Carlo simulations and the experiment QUEST, has been used for the reconstruction of EAS parameters. The corrected energy spectrum in the knee region is obtained. The mean depth of the EAS maximum has been derived both from the analysis of LDF steepness and the FWHM of Cerenkov light pulse. The mean mass composition around the knee is estimated. 
D.Chernov, E.Korosteleva, L.Kuzmichev, V.Prosin, I.Yashin (Scobeltsyn   Institute of Nuclear Physics of MSU, Moscow, Russia)...