The spectrum of high energy phonons injected into liquid4He
โ Scribed by M.A.H. Tucker; A.F.G. Wyatt
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 162 KB
- Volume
- 194-196
- Category
- Article
- ISSN
- 0921-4526
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๐ SIMILAR VOLUMES
High energy phonons (ttw/k$lOK) and R+ rotons can be injected into liquid 4He by a thin film heater. It is shown that these excitations may interact with the large number of low energy phonons which are also emitted. The conditions for avoiding this are analysed and compared to measurements.
The system of equations that describes the temporal and spatial evolution of low-energy phonons (l-phonons) is obtained for the cases of plane and axial symmetry. From the solutions of these equations, we discuss the time-resolved measurements of the angular distribution of lphonons. These show a ra
Adopting the separability assumption in conjunction with the hypernetted-chain approximation and the minimum principle of Helmholtz free energy based on the trial density matrix expressed in terms of Jastrow-type wave functions, a set of coupled Euler-Lagrange equations are obtained for the radial d