WHERE IS THE NON-SPIN-FLIP ISOVECTOR MONOPOLE RESONANCE IN TL-208

The experimental study of the Delta T-z=+1 component of the isovector monopole resonance of Pb-208 has revealed itself as an experimental pu zzle. We present in this work a theoretical calculation of the strengt h distribution of this resonance and of its neutron decay properties, within the framework of a model in which random phase approximation st ates are coupled with continuum configurations and with a set of ''doo rway states'' in order to describe the basic escape and damping mechan isms of the nuclear vibration. Our results are compared with existing measurements and with other theoretical analyses.