In physics, the Lamb–Mössbauer factor (LMF, after Willis Lamb and Rudolf Mössbauer) or elastic incoherent structure factor (EISF) is the ratio of elastic to total incoherent neutron scattering, or the ratio of recoil-free to total nuclear resonant absorption in Mössbauer spectroscopy.
When first reporting on recoil-free resonance absorption, Mössbauer (1959)[1] cited relevant theoretical work by Lamb (1939).
Singwi and Sjölander (1960)[4] pointed out the close relation to incoherent neutron scattering.
Subsequently, the term elastic incoherent structure factor became more frequent.
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