Abstract
The article considers events in an experiment with X-ray emulsion chambers (XREC) to study the cores of extensive air showers (EASs) with energies of nuclei of primary cosmic radiation (PCR) \(E_{0}>100\) TeV, which currently have no explanation within the Standard Model of nuclear interactions (SM). The XREC method is the only one that allows studying EAS cores with a high coordinate resolution of about 100 \(\mu\) m. EAS cores contain the most complete information about primary acts of nuclear interactions, as a result of which all unusual events recorded by the XREC method are of great scientific interest. Several types of unusual events recorded by the XREC method are explained within the SM.
