Abstract
The spin-flip E1-states in medium and heavy spherical nuclei are investigated within the quasiparticle-phonon nuclear model. The RPA-calculations predict the existence of a collective 1--state formed by the isovector spin-dipole force. Its excitation energy is about 20 MeV. This state is intensively excited by the inelastic electron scattering at momentum transferred q ≈ 0.5-0.7 fm-1, at the scattering angles θ > 60° the main contribution to its excitation comes from the transversal form factor. Therefore, it can be recognized as the transversal E1-resonance. The interaction with two-phonon states causes a very strong spreading of the resonance, thus making its experimental observation hardly probable.
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