Study of the Breathing Mode ofPb208through Neutron Decay

Abstract
The neutron decay of the giant monopole resonance region between 13 and 15 MeV in Pb208 is analyzed in terms of collective and statistical doorway states. The direct escape widths of the giant monopole resonance populating the lowest five valence hole states of Pb207 are determined, and compared with the results obtained from complex collective states. This comparison discriminates sharply between different model Hamiltonians which predict similar energies and collectivities for the resonance.