Abstract
A new type of slow chopper intended for use in neutron inelastic scattering measurements has been constructed, which has a transmission curve much narrower than what is usual for slow choppers. This chopper is operated in conjunction with a beryllium filter to give a transmitted neutron spectrum of a half value width of ≈0.3 Å at 4 Å which is a considerable improvement over the usual width of the cold neutron spectrum of more than 1 Å. The time resolution of the new instrument corresponds to 12 μsec/meter. A full description is given of the construction and operation of the instrument.
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