Abstract. Radiative nucleon-deuteron capture and photo disintegration of the three-nucleon bound state with two-body final states are described. The description uses nucleon degrees of freedom extended to include the excitation of a single nucleon to a ∆-isobar. The baryonic interaction and the electromagnetic current couple nucleonic states and states with a ∆-isobar. Exact solutions of three-particle scattering equations are employed for the initial or final states of the reactions. The current has one-baryon and two-baryon contributions. The role of the ∆-isobar in the description of the considered photo reactions is discussed and found to be moderate. The spin observables Ayy and T20 at 90• lab scattering angle can be calculated model-independently from the E1 Siegert term in the long-wavelength limit.
The contribution describes inelastic electron scattering from 3 He with two-body final states. The description allows for single Δ-isobar excitation and includes final-state interaction and meson exchange currents.
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