Study of the 7.285-MeV level in lead-208 using a rotor technique

The 7.285-MeV level in Pb208, excited by thermal neutron capture gamma rays from iron, was studied using a rotating target to vary the energy of the gamma rays seen by the target. Energy shifts of -1.07, -1.75, +1.65, and +2.57 eV were achieved, and the observed changes in scattered intensity are consistent with the resonant Pb208 level lying 6.51 eV below the iron capture gamma-ray line.