S- and P-wave neutron spectroscopy Part Xd: Intermediate structure, particle-vibration states

The weak coupling particle-vibration model is extended to lowlying neutron resonances in certain even-even or odd-odd nuclei by coupling the extra particle to core excited states of the odd mass target. The odd hole or particle in the target is treated as a passive spectator. ²⁰⁸Pb and ²¹⁰Bi are studied as test cases and the calculated resonance quantities are in good general agreement with the average features of high resolution experiments. The resonances in ²⁰⁸Pb and ²¹⁰Bi are related to the same intrinsic doorway in ²⁰⁹Pb. The ²¹⁰Bi data is presented here for the first time.