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In Neutron time-of-flight scattering, a form of inelastic neutron scattering, the initial position and velocity of a pulse of neutrons is fixed, and their final position and the time after the pulse that the neutrons are detected are measured. By the principle of conservation of momentum, these pairs of coordinates may be transformed into momenta and energies for the neutrons, and the experimentalist may use this information to calculate the momentum and energy transferred to the sample. Inverse geometry spectrometers are also possible. In this case, the final position and velocity are fixed, and the incident coordinates varied. Time-of-flight scattering can be performed at either a research reactor or a spallation source. ==External links== Existing time-of-flight spectrometers at pulsed sources: *(Pharos ) at (LANSCE )'s (Lujan Center ) at Los Alamos National Laboratory *(MAPS ), (MARI ), (HET ) *(MERLIN ) and (LET ) at the ISIS neutron source *(ARCS ), (CNCS ), and (SEQUOIA ) at the Spallation Neutron Source Existing time-of-flight spectrometers at continuous sources: *(DCS ) and (FCS ) at the NIST laboratories in Maryland. *(IN4 ), (IN5 ), and (IN6 ) at the Institut Laue-Langevin *(TOFTOF ) at the Forschungsneutronenquelle Heinz Maier-Leibnitz *(SKAT-EPSILON ) at the Joint Institute for Nuclear Research (JINR) *(PELICAN ) at the Australian Nuclear Science and Technology Organisation *(FOCUS ) at the Paul Scherrer Institute *Mibemol at the Laboratoire Léon Brillouin (under reconstruction) Related projects: * (Neutronsources.org ) - Collaboration website of all neutron facilities * (Integrated Infrastructure Initiative for Neutron Scattering and Muon Spectroscopy (NMI3) ) - a European consortium of 18 partner organisations from 12 countries, including all major facilities in the fields of neutron scattering and muon spectroscopy 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Neutron time-of-flight scattering」の詳細全文を読む スポンサード リンク
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