PRIMARY MASS COMPOSITION INVESTIGATIONS AT ENERGIES 10(4)-10(7) GEV AND SELECTION OF EAS AT MOUNTAIN ALTITUDES

摘要

A new EAS selection method is developed for observation levels 500 less than or equal to X(0) less than or equal to 700 g.cm(-2) and energies 10(4) - 10(7) GeV. This gives the possibility to obtain a practically unbiased energy spectrum and mass composition estimation in this energy interval. Specific EAS experiments placed at observation levels 500 - 600 g.cm(-2) are necessary in order to calibrate the indirect methods for obtaining the energy spectrum and mass composition of the primary cosmic flux at energies higher than 10(6) GeV. [References: 25]