Neutron scattering, inelasti

Crystal analyser instruments at pulsed sources are used in the time-of-flight mode. There are two main types of instrument those that use a variable final energy and those that use a fixed final energy. There is only one working example of the former t)q)e at present, PRISMA [22] at ISIS. This is used exclusively for coherent inelastie neutron scattering and so will not be considered further here. 

Thus, when x-rays are scattered by matter, even when there is an exchange of energies between the motion of atoms and the x-ray photon, the energy of the photon is scarcely affected. On the other hand, when neutrons are scattered inelasti-cally, their energies can be modified to an appreciable extent that can be measured experimentally. 

Sum] Sumin, V.V., Morozov, S.I., Natkanets I., Petm, D., Inelastie Scattering of Slow Neutrons Study of Local Oscillations of Carbon Atoms in Fe-Mn-C and Fe-Ni-C Alloys , Phys. Met. Metallogr, 65, 155-159 (1988), translated from Fiz. Met. Metalloved., 65, 168-172 (1988) (Experimental, Phys. Prop., 16)... 

The eroes eeetione are defined ae follows ie the fission cross section et M the elastic transport cross section (the scattered neutron remains in the group) is the inelastie scattering cross section (the scattered neutron goes into group 0) 0 is the capture cross see tion and + < t ... 

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