FIELD: physics.
SUBSTANCE: method comprises modulating intensity of a beam of polarised neutrons by transmitting direct current pulses to a foil to form a sharp boundary of the direction of magnetic fields upstream and downstream the foil; simultaneously downstream the foil, exposing the transmitted neutrons to an additional magnetic field to facilitate adiabatic polarisation change by 180 degrees; measuring the time of flight of each modulated neutron over a fixed foil-to-detector distance, from which the velocity or energy of said neutrons is determined.
EFFECT: high time resolution, wider range of measured wavelengths of slow neutrons and simple method.
7 dwg
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