The p( $^{12}$C,$^{12}$N)Δ0 reaction was studied at SPES4 (Saturne) using a $^{12}$C beam of 1100 MeV/N at the spectrometer angle θ = 0 ◦ [32]. The data are read, integrated over three channels and shown as a function of M$_{X}$. Fig. 21 shows these data, fitted with the Δ 0 peak and the structures previously observed. The important oscillatory behaviour is very well reproduced by the fit. FIG. 21: (Color online.) Cross-section of the p( $^{12}$C,$^{12}$N)Δ0 reaction at T$_{p}$ =1100 MeV/N θ = 0 ◦ [32]. The p( $^{20}$Ne,$^{20}$F)Δ++ and the p( $^{20}$Ne,$^{20}$Na)Δ0 reaction were measured at SPES4 (Saturne) with the $^{20}$Ne beam at 900 MeV/N θ = 0 ◦ [32, 33]. The data are read, and shown versus M$_{X}$ in Fig. 22. The p( $^{20}$Ne,$^{20}$F)Δ++ cross-sections, (insert (a)), are integrated over two channels. The same width (FWHM=120 MeV), the same mass, and a ratio of three, determined by the isospin Clebsh-Gordan coefficients, are attributed to Δ ++ and Δ $^{0}$. Such ratio supposes that the difference between the form factors of the final nuclei $^{20}$F and $^{20}$Na, differ only by a small amount. We observe small contributions of the first narrow baryonic masses - compatible with zero - in insert (a). This result can be explained again by the expected isospin for these masses [3]. In the same way, the large cross-section around M ≈ 1200 MeV in insert (a), agrees with the previous expectation, namely isospin=3/2. FIG. 22: (Color online.) Cross-section of the p( $^{20}$Ne,$^{20}$F )Δ ++ reaction (insert (a)), and p( $^{20}$Ne,$^{20}$Na)Δ0 reaction (insert (b)) with T 20 $_{Ne}$=18 GeV, θ =0 ◦ [31–33]. IX. CHARGE EXCHANGE REACTIONS WITH INCIDENT HEAVY ION BEAMS A. The p( $^{12}$C,$^{12}$N) Δ 0 reaction B. The p( $^{20}$Ne,$^{20}$F) Δ ++ and the p( $^{20}$Ne,$^{20}$Na) Δ 0 reactions 15