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The characteristics of extensive air showers that are sensitive to the masscomposition of primary cosmic radiation are recorded in the EAS core. Thesecharacteristics include the parameters of the phenomenon of "halo". Studieshave shown that the bulk of the events recorded in XRECs are produced byprotons and He nuclei, which allows the estimation of the fraction of lightnuclei in PCR. The events under analysis were obtained in the XREC PAMIRexperiment, and the properties of these events were studied at distancesextending up to about 10 cm from the EAS axis with a resolution ofapproximately 30 micro m. The investigation of the parameters of events in EAScores by the halo method permitted analyzing the mass composition of PCR atE0=10 PeV and assessing the fraction of light nuclei in PCR, which depend onlyslightly on the model of EAS propagation through the atmosphere. From ananalysis of gamma-ray families featuring a halo and multicenter halos obtainedin the PAMIR XREC, it was found that the fraction of the p+He component of PCRwas about 40%.

The fraction of light nuclei in the mass composition of primary cosmic radiation at E0=1-100 PeV