model predictions [9, 10] are rather far from the data. The reanalysis of the two smallest angles: θ = 6 . 59 ◦ and 8 . 05 ◦ , respectively in inserts (a) and (b), is shown in Fig. 2. The broad curve is plotted to drive the eyes through the small triangle points which reproduce the result of the theoretical calculation [10] including the contribution from Δ and Roper excitations. We believe that the significant gap between this calculation and data can be filled by the exotic baryonic structures. For this aim we take the fitting function as a sum of gaussians centered at fixed values quoted above, with a constant width. The only free parameters are the relative normalization. This allows to get a good fit to the data. The expected structure around M=1320 MeV is absent; it will also be the case for other fits shown later on. FIG. 2: (Color online). Cross-section of the p(d,d)X reaction at p$_{d}$=2.95 GeV/c, [9] measured at Saturne (SPES4 beam line). Inserts (a) and (b) show respectively the results for θ = 6 . 59 ◦ and 8 . 05 $^{◦}$. The theoretical calculation [10] is shown by the small triangles and the thin curve to drive the eyes. Large statistics spectra of the p( α, α ′ )X reaction were obtained several years ago at SPES4 (Saturne) in order to study the radial excitation of the nucleon in the P 11 (1440 MeV) Roper resonance. The experiment was performed with T$_{α}$=4.2 GeV. A spectrum mea- sured at T$_{α}$=4.2 GeV, θ = 0 . 8 ◦ [11] was obtained in the baryonic missing mass range: 1030 ≤ M ≤ 1490 MeV. Fig. 3 shows these data for the cross-section. A first large peak around ω ≈ 240 MeV was associated with the projectile excitation, and a second large peak around ω ≈ 510 MeV was associated with the target excitation [11]. Here ω is the energy difference between the incident and the detected α particles. Above these large peaks lie narrow peaks, clearly observed, defined by a large number of standard deviations [12] (see Fig. 3) . A second spectrum with large statistics was measured at T$_{α}$=4.2 GeV, θ = 2 ◦ [13] which extended up to M=1588 MeV. Fig. 4 shows this data. In both figures, the empty circles, IV. THE P( α, α $^{′}$)X REACTION 4