Statistical and nonstatistical neutron decay of the giant electric dipole resonance ofPb208

The neutron decay of the giant electric dipole resonance of ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$ has been determined by a measurement of the differential cross section, dσ(${\mathit{E}}_{\gamma }$,${\mathit{E}}_{\mathit{n}}$)/${\mathit{dE}}_{\mathit{n}}$ of the ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$(γ,n) reaction for 20 contiguous photon energy bands between 11.2 and 15.7 MeV. The statistical component of the decay was calculated in the Hauser-Feshbach formalism. A nonstatistical component of the decay to low-lying hole states is unambiguously identified. The magnitude of this component is strongly energy dependent.