Abstract
Wave function components containing a single Δ-isobar are included in the calculation of the three-nucleon bound states. The two-nucleon interaction acts in all partial waves up to total angular momentumI=2. The presence of a Δ-isobar increases the three-nucleon binding energy by about 0.3 MeV, 0.6MeV repulsion being a dispersive two-body effect, 0.9 MeV attraction arising from the three-nucleon force with intermediate Δ-isobars. The effect of the Δ on the three-nucleon charge and magnetic form factors is investigated. The possibility of treating the Δ-isobar as a dynamic pion-nucleon system in nuclear structure and nuclear-structure corrections beyond single Δ excitation in the coupled-channel approach are also discussed.
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