Abstract
On the basis of an investigation of muon group parameters a conclusion is drawn on the existence of a cutoff in energy spectra of primary cosmic ray nuclei in the energy range > 10 16 eV. The destruction of nuclei on some background of the interstellar medium, consisting of objects (elementary particles) with mass ≲30 eV, is proposed as a mechanism responsible for this effect. The possibility of an identification of these objects with dark matter is not excluded.
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