have been reported in Table 2. Most of the data were shown without preselecting those which present the most pronounced oscillations, well fitted by the exotic baryonic structure masses. This paper does not pretend to give an exhaustive outline of all existing data. These structures were associated with quark clusters [3] [4]. This can explain the fact that reactions performed with incident leptons, which in principle allow similar observations [37], lead to smaller signals than reactions performed with incident hadrons. In this case the number of quarks involved in the reactions are reduced. All reactions reanalyzed here were measured in view of another physical goal, therefore the binning and the statistics were not optimized for the present study. So, there is here no attempt to study the mass range 950 ≤ M ≤ 1000 MeV, although several spectra exhibit an excess of counting over the fits. Moreover, this missing mass region, when composite targets are concerned, corresponds also to possible excitation of nuclei excited states. In almost all spectra, clear structures are however observed, mainly in the mass re- gion 1000 ≤ M ≤ 1130 MeV before the region where the Δ starts to dominate the countings. This mass range concerns the structures at M=1004 and 1044 MeV, particularly interest- ing since they are both located at masses lower than the threshold of possible pion-nucleon disintegration. The narrow baryonic resonances are observed in almost all missing mass range studied. The most noteworthy spectra, are those showing notable oscillations well fitted by the narrow structures. This concerns a large part of the reactions discussed pre- viously, namely the spectra corresponding to the pp → p π $^{+}$X, (d,2p)X, (p,t)X, d($^{3}$He,t)X, p( $^{12}$C,$^{12}$N)X, $^{12}$C($^{16}$O,$^{16}$N)X, ($^{20}$Ne,$^{20}$F)X, and ($^{20}$Ne,$^{20}$Na)X reactions. The comparison between final states with isospin T=1/2 and T=3/2 leads us to favor isospin T=1/2 for the lower narrow structure masses. These structures are more easily observed in reactions using isoscalar scattered particles such as α or deutons. We notice however that the overall results suggest possible isospin degeneracy. In order to reproduce the masses of exotic, narrow, and weakly excited baryons, we use a phenomenological relation wich describe them by a configuration adding one (or more) q ¯ q pairs to the classical qqq configuration. Such approach was justified theoretically [38] in a paper which discussed the existence of the pentaquark: In fact the Skyrme model is in accordance with quarks but it is in one way better as it allows baryons to be made of N$_{c}$ quarks, plus an indefinite number of Q ¯ pairs . Although theoretical studies must be carried out to describe these observations, it is useful 18