The cross section for $\gamma$-ray emission associated with inelastic scattering of neutrons in the ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}(n,n^{\prime }\gamma ){}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$ reaction has been measured at several angles for neutron energies between 3.1 and 5.25 MeV. The experimental data have been compared with calculations based on the Satchler formalism, with allowance for width-fluctuation corrections. Agreement for the 2.61-MeV $\gamma$ ray is excellent throughout. The experimentally observed cross sections for the other $\gamma$ rays were generally 30 to 50% below the theoretical values, except for the 0.583-MeV $\gamma$ ray, for which the observed values were well above the theoretical values. Resolution of several $\gamma$-ray peaks with a Ge(Li) detector has led to a modified level scheme for ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$.

[NUCLEAR REACTIONS ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}(n,n^{\prime }\gamma ){}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$, $E=3.1-5.25\mathrm{}$ MeV, measured $\sigma (E,\theta )$ for deexcitation $\gamma$ rays. Compound nuclear theory analysis, including width fluctuations.]

• Received 31 May 1972

DOI:https://doi.org/10.1103/PhysRevC.9.1972