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Abstract:
In period of 1958-1989 the Moscow State University group made measurements
of the Cosmic Ray penetrating component at the depth of 40 mwe
underground. Above the underground room the EAS array operated in
conjunction with the underground detectors.
In that period various underground detectors were in operation: EAS muon
flux detector of area 37 sq. m (muon threshold energy 10 GeV), magnetic
muon spectrometer (MDM 500 GeV/c), secondary shower detectors.
EAS muon detectors proved to be very useful in study of EAS physics (the
invariance of scaling model was approved, the knee in the primary spectrum
was confirmed, the changing of primary composition in the knee region is
indicated).
In measurements of "single" particle interactions underground the
disageement with the expected secondary shower size spectrum from muon
component was found. This disagreement was interpreted in the MSU original
papers as an indication of the existence of unknown penetrating primary
component. In the present talk this data are discussed in view of a
recent suggestion of new SUSY particles (G. Farrar).
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