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The discovery of multiple MSs in NGC2808 and Omega Centauri, and multipleSGBs in NGC1851 and NGC6388 has challenged the long-held paradigm that GCsconsist of simple stellar populations. This picture has been furthercomplicated by recent studies of the LMC intermediate-age clusters, where theMSTO was found to be bimodal or broadened. We have undertaken a study ofarchival HST images of LMC and SMC clusters with the aim of measuring thefrequency of clusters with evidence of multiple or prolonged star formationevents and determining their main properties. In this paper, we analyse the CMDof 16 intermediate-age LMC clusters. We find that 11 clusters show an anomalousspread (or split) in color and magnitude around the MSTO. We demonstrate thatthe observed feature is unequivocally associated to the clusters and that it isnot an artifact due to photometric errors, differential reddening or binaries.We confirm that NGC 1806 and NGC 1846 clearly exhibit two distinct MSTOs andobserve, for the first time, a double MSTO in NGC 1751. In these three clustersthe population corresponding to the brighter MSTO includes more than two-thirdsof cluster stellar population. We confirm the presence of multiple stellarpopulations in NGC 1783 and suggest that the MSTO of this cluster is formed bytwo distinct branches. In 7 clusters (ESO057-SC075, HODGE7, NGC1852, NGC1917,NGC1987, NGC2108, and NGC2154) we observed an intrinsic broadening of the MSTOthat may suggest that these clusters have experienced a prolonged period ofstar formation (150-250 Myr). The CMDs of IC2146, NGC1644, NGC1652, NGC1795 andNGC1978 show no evidence of spread or bimodality. In summary 70$\pm$25% of oursample are not consistent with the simple, single stellar population hypotesis.

Multiple stellar populations in Magellanic Clouds clusters. I. An ordinary feature for intermediate age globulars in the LMC?