Photodisintegration and Coherent $${\pi^{0}\pi^{0}}$$ Photoproduction on the Deuteron in the $${d^{*}(2380)}$$ Region

Deuteron photodisintegration is calculated in the photon energy range $$500{-}600$$ MeV, adopting a standard theory in which the nucleonic one-body current, meson exchange currents and isobar excitations are taken into account. The final-state interaction in the isospin-1 states is treated within a three-body $$\pi NN$$ model approach. The main attention is paid to the possible contribution of the $$d^{*}(2380)$$ dibaryon. Its influence on this reaction is compared with its role in coherent $$\pi^{0}\pi^{0}$$ photoproduction on a deuteron at the same energies.