J. Procureur et Jn. Stamenov, PRIMARY MASS COMPOSITION INVESTIGATIONS AT ENERGIES 10(4)-10(7) GEV AND SELECTION OF EAS AT MOUNTAIN ALTITUDES, Nuclear physics. B, 1995, pp. 242-250
A new EAS selection method is developed for observation levels 500 les
s than or equal to X(0) less than or equal to 700 g.cm(-2) and energie
s 10(4) - 10(7) GeV. This gives the possibility to obtain a practicall
y unbiased energy spectrum and mass composition estimation in this ene
rgy interval. Specific EAS experiments placed at observation levels 50
0 - 600 g.cm(-2) are necessary in order to calibrate the indirect meth
ods for obtaining the energy spectrum and mass composition of the prim
ary cosmic flux at energies higher than 10(6) GeV.