The recoilless emission of gamma
rays from certain crystals discovered
by Rudolf Ludwig Mössbauer (1929–) in 1957. When gamma rays are
emitted from most nuclei, the latter recoil to a variable extent, giving
the emitted photons a broad energy spectrum.
Mössbauer found that certain crystals, e.g. Fe57, recoiled
as a whole, i.e., their effective recoil was negligible. Gamma rays of closely
specified frequency are thus produced and can be used for nuclear clocks
and for testing relativity theory predictions.
|The nuclear decay scheme for 57Co → 57Fe and
various backscattering processes for 57Fe that can follow resonant
absorption of an incident gamma photon, modified from DeGrave et al.
(2005) and Dyar et al. (2006)
AND NUCLEAR PHYSICS