Meson-Exchange Hamiltonian forNNScattering up to 1 GeV andΔ-Nucleus Dynamics

A Hamiltonian for $\pi$, $N$, and $\Delta$ is constructed from meson-exchange mechanisms. The $\mathrm{NN}$ interaction in the model is directly derived from the Paris potential. Good fits to $\mathrm{pp}$ scattering data up to 1 GeV, including the "resonant" ${}_{}{}^1{}_{}{}^{}D_2^{}{}_{}{}^{}$ and ${}_{}{}^3{}_{}{}^{}F_3^{}{}_{}{}^{}$ partial waves, have been obtained when a $\pi N\leftrightarrow \Delta$ interaction is introduced in a dynamical three-body approach. The model can be used for a many-body study of $\Delta$-nucleus dynamics.