Some features of neutron scattering in superfluid helium
The shape of the spectrum of inelastic neutron scattering by helium is investigated in the near-threshold regions where an important role is played by the interaction of the excitations. The attraction between the rotons at large momenta on the shape of the spectrum is considered near its end point. The experimental data on neutron scattering with production of excitations near the maximum of the dispersion curve at increased pressures are explained. The spectrum near the phonon-emission threshold is investigated in the case when the group velocity of the excitations exceeds the sound velocity in a certain region. It is shown that at arbitrarily low temperatures, the neutron-scattering spectrum line corresponding to the production of one roton has a wing on the high-energy side.
- Research Organization:
- Institute of Physics Problems, USSR Academy of Sciences
- OSTI ID:
- 5541733
- Journal Information:
- Sov. Phys. - JETP (Engl. Transl.); (United States), Journal Name: Sov. Phys. - JETP (Engl. Transl.); (United States) Vol. 54:2; ISSN SPHJA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COHERENT SCATTERING
DIFFRACTION
EVEN-EVEN NUCLEI
FLUIDS
HELIUM 4
HELIUM II
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
NEUTRON DIFFRACTION
NUCLEI
PHONONS
PRESSURE DEPENDENCE
QUANTUM FLUIDS
QUASI PARTICLES
ROTONS
SCATTERING
STABLE ISOTOPES