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Neutron time-of-flight scattering
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<p>In neutron time-of-flight scattering, a form of <a href="/facts/Inelastic_neutron_scattering/wMze4rvs">inelastic neutron scattering</a>, the initial position and velocity of a pulse of <a href="/facts/Neutron/oRCM1geb">neutrons</a> are 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 are varied. </p><p>Time-of-flight scattering can be performed at either a <a href="/facts/Research_reactor/lA2UNTuV">research reactor</a> or a <a href="/facts/Spallation/k7AsUBbk">spallation</a> source. </p>