NEUTRON ENERGY SMALL CHANGES MEASUREMENT METHOD Russian patent published in 2017 - IPC G01N23/00 

FIELD: physics, measurement equipment.

SUBSTANCE: invention refers to the field of research and analysis of materials using precision neutron spectrometry based on the method of spin-echo small-angle scattering. A method for measurement of small changes in neutron energy is based on the spin-echo spectroscopy and consists of direction of the polarized neutrons beam to the first - entrance area of the neutron spin precession, providing spatial splitting of the neutron flux in the two states with different spin projections onto the magnetic field, and, after passage of the working area where the neutron beam is influenced, the reverse mixing of the beam takes place in the second - exit area of the neutron spin precession in a magnetic field with the same magnitude as the first precession area magnetic field, but in opposite direction, and the measurement of the neutron energy change is determined by the non-zero spin-echo signal, wherein perfect monocrystals are arranged in the entrance and exit areas of the neutron spin precession according to the Laue difraction geometry to increase spatial splitting of a neutron beam due to difraction, thus increasing the value of the spin-echo signal, at that the perfect monocrystals are arraged with therir crystallographic plane parallel to each other.

EFFECT: invention provides high sensitivity for measurement of neutron energy small changes.

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