A high-resolution gamma monochromator having a resolution of ≁10-6 is described. The variable-energy γ source is obtained by nuclear resonance scattering, of neutron-capture γ rays, through various scattering angles. Several possible examples of combinations of γ sources and resonance scatterers are discussed. In particular, a lead target was employed to scatter the 7.28 MeV γ line of neutron-capture γ rays of iron. Variation of the angle of the resonantly scattered 7.28 MeV photons between 60°-150° permits an energy scan of 400 eV in any absorber. Thus, nuclear energy levels in some absorbers were photoexcited and the corresponding ground-state widths were extracted from the measured absorption spectrum. The results for the case of a Ce absorber are discussed in detail.
ASJC Scopus subject areas
- Medicine (all)