Zero-field neutron spin echo techniques for incoherent scattering

Spin-incoherent scattering reduces the polarization in a conventional spin echo spectrometer by a factor of 3, which is a serious drawback for incoherent measurements. With a special option of the zero-field spin echo technique called MIEZE1 this problem can be overcome. In a MIEZE1-spectrometer the analyzer is upstream of the sample, leaving the signal indifferent to magnetic fields and spin flips in the sample. Special care has to be taken in order to achieve equal flight lengths for all scattered neutrons. Using reflection geometry, measurements at all scattering angles are possible. Recent results from the NRSE instrument at the LLB/Saclay are presented.