Isospin of the fine structure between 8 and 12 MeV in (208)Pb and its implication for the multipole assignment of the 8.9-MeV resonance
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The giant-resonance region between 8 and 12 MeV measured by (e, e') in (208)Pb is disentangled into narrow lines (I,& 4 keV) and broad resonances (I,& 1800 keV). The narrow lines at 10.07, 10,60, and 11.37 MeV have an E2 angular distribution, and assumption of b, T = 1 for them explains controversial experimental results of electromagnetic and hadronic experiments. The new analysis makes an assignment for the 8.9-MeV resonance other than monopole difficult to understand.
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