ON THE PROPERTIES OF ELEMENTARY EXCITATION SPECTRUM NEAR THE DISINTEGRATION THRESHOLD ON THE EXCITATIONS (in Russian)
Journal Article
·
· Zhur. Eksptl'. i Teoret. Fiz.
OSTI ID:4250074
The singularity of the Bose fluid Green's function near the excitation disintegration threshold is investigated by quantum field theory methods without assuming weakness of the interaction. Three possible types of decay thresholds are shown. In the first case the excitation velocity at the threshold point p = pc equals that of sound; thus starting from this point the excitation can produce phonons which results in damping proportional to (p/sub c/--p)/sup 3/. In two other cases excitation in the threshold point can break up into two excitations with nonzero momenta which are either parallel to each othcr or form a definite angle. In both cases the spectrum curve ends at the threshold points and the excitation velocity at this point is equal to that of each of the excitations produced in the decay. Scattering of neutrons in the liquid involving the production of excitations near the threshold is considered. (auth)
- Research Organization:
- Inst. of Problems in Physics, Academy of Sciences, USSR
- NSA Number:
- NSA-13-014828
- OSTI ID:
- 4250074
- Journal Information:
- Zhur. Eksptl'. i Teoret. Fiz., Journal Name: Zhur. Eksptl'. i Teoret. Fiz. Vol. Vol: 36
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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