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AGNES is an inelastic neutron spectrometer installed at the C3-1-1 beam port of a cold neutron guide of JRR-3M. Neutrons with wavelength of 4.22 Å or 5.50 Å are selected by a series of five PG002 monochromators and pulsed by a Fermi chopper (FWHM of the pulse is 30mm or 12mm). These neutrons are irradiated to a sample and then the scattered neutrons are counted simultaneously by many detectors set at every 1°(10° < 2θ < 130°) and at 1.8m apart from the sample. From the neutron counts as functions of time-of-flight and scattering angle, the probability of energy and momentum transfer from a sample (i.e., dynamic structure factor S(Q,ω)) is determined.
Atomic and molecular vibrations in solids and liquids (e.g., phonon and magnon dispersion relations) are investigated from inelastic scattering data, while diffusive motions (e.g., diffusion coefficient and jump distance) from quasielastic scattering data. The above information is quite useful for the studies not only in traditional solid state physics but also in currently-active fields such as solution chemistry, life science and material science.
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