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The change in the fluxes of the lightest and heaviest nuclei in the masscomposition of primary cosmic radiation in the energy range of E0 = 1-100 PeVis analyzed on the basis of data from the KASCADE-Grande experiment. Thisanalysis is performed by means of the min-max age (Smin-max) method forextensive air showers (EAS) that is proposed in the present article. Thismethod makes it possible to estimate the exponents of the spectra for thelightest and heaviest nuclei in the mass composition of primary cosmicradiation and to study irregularities in these spectra at energies E0 in therange under consideration. The Smin-max method for estimating the masscomposition of primary cosmic radiation is based on a sizable sample (more than100 million events) of data on EAS features in the range of E0 = 1-100 PeV fromthe KASCADE-Grande experiment. It is shown that, in the primary-energy range ofE0 = 1-100 PeV, the exponent in the integrated spectrum changes from 2.1 to 2.7for the lightest nuclei in the mass composition of primary cosmic radiation andfrom 1.5 to 2.1 for the heaviest nuclei. These results comply with theconclusion drawn by the KASCADE-Grande Collaboration that the knee in the E0spectrum of nuclei of primary cosmic radiation in the range of E0 = 3-5 PeV isdue to the elimination of light nuclei. The bump appearing in the E0 spectrumof primary cosmic radiation according to the database of the KASCADE-Grandeexperiment and lying in the range of E0 = 50-75 PeV is analyzed by the Smin-maxmethod and is found to agree with data of the GAMMA (GAMMA-07) experiment.

Change in the mass composition of primary cosmic radiation at energies  in the range of E0 = 1-100 PeV according to data of the KASCADE-Grande  experiment