ON TWO-PHONON PROCESSES IN NEUTRON DIFFRACTION AGAINST CRYSTALS
Journal Article
·
· Arkiv Fysik
OSTI ID:4321968
The two-phonon processes in slow neutron scattering against single crystals are discussed. It is shown that in the harmonic approximation the energy distribution of neutrons scattered coherently in a certain direction in some cases has logarithmic singularities for the energies obtained in the one- phonon processes. Further there appear singularities of the same kind as Van Hove found earlier for the incoherent one-phonon scattering. To il lustrate the logarithmic singularities more explicit resuits are given for an ideal Debye crystal. A formula for the incoherent two-phonon scattering is also given, and this is applied on KCl. (auth)
- Research Organization:
- Univ. of Uppsala
- NSA Number:
- NSA-12-008800
- OSTI ID:
- 4321968
- Journal Information:
- Arkiv Fysik, Journal Name: Arkiv Fysik Vol. Vol: 13
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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OSTI ID:4719680