Structure and direct protonic decay of isobaric analogous and isovector monopole giant resonances

A description of the partial protonic widths of isobaric analogous resonances is proposed on the basis of the continuum random-phase approximation and a partly self-consistent phenomenological version of the theory of finite Fermi systems. The results of the calculations performed for spherical nuclei over a wide interval of atomic-mass values are in satisfactory agreement with the corresponding experimental widths. The probability of the direct protonic decay of an isovector monopole giant resonance in the β− channel is estimated in connection with some recent experiments.