  A semimicroscopical approach is applied to calculate: (i) strength functions
for the charge-exchange spin-dipole giant resonances in the 208Pb parent
nucleus; (ii) partial and total branching ratios for the direct proton decay of
the resonance in 208Bi. The approach is based on continuum-RPA calculations of
corresponding reaction-amplitudes and phenomenological description of the
doorway-state coupling to many-quasiparticle configurations. The only
adjustable parameter needed for the description is found by comparison of the
calculated and experimental total widths of the resonance. Other model
parameters used in calculations are taken from independent data. The calculated
total branching ratio is found to be in reasonable agreement with the
experimental value.
