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The first parts of the thesis recalls the main features of the large MACROexperiment at the underground Gran Sasso Laboratory. It then describes theatmospheric muons measured by the experiment and the selection criteria toobtain and analyze a large sample of cosmic muons. The time series of MACROmuons was analyzed with two complementary approaches: search for the occurrenceof bursts of muon events and search for periodicities in the muon timedistribution. The Scan Statistics method was used in the first case and theLomb-Scargle spectral analysis in the second case. The two techniques completeearly analyses performed with "folding" methods. It is confirmed that theseasonal variation is the dominant periodic variation, and one also confirmsthe solar diurnal and sidereal modulations. A separate study concerns theanalysis of the energy losses of the hypothetical Nuclearites in differentmaterials and detectors; their importance for the searches performed by theMACRO and the SLIM experiments is discussed.

Recherche De Correlations Temporelles Des Muons Cosmiques Avec Macro Et Perte D'Energie Des Nuclearites