H. Dewaard et F. Tenbroek, COHERENT RESONANT SCATTERING OF NUCLEAR RADIATION IN A PARAMAGNETIC ABSORBER PLACED IN A MAGNETIC-FIELD, Hyperfine interactions, 80(1-4), 1993, pp. 1335-1339
When a thick Mossbauer absorber of (paramagnetic) ferric alum enriched
in Fe-57 is placed in a longitudinal magnetic field of 270 G, a reduc
tion of the intensity of backscattered resonant radiation from a 57COR
h is observed. This is interpreted as caused by an increase of the deg
ree of coherence of the resonant radiation re-emitted by the absorber.
Further experiments are needed to corroborate this interpretation.