Nuclear resonance fluorescence inPb206,207,208andBi209

Abstract
Using bremsstrahlung produced with 6.6 and 9.7 MeV beams, nuclear resonance fluorescence measurements were made on targets of Pb206,207,208 and Bi209. Ground state transition widths for previously unknown energy levels with widths 1 eV were obtained. An interpretation of several of these levels in terms of a particle-core weak coupling model is suggested.