New approach to the observation of the condensate fraction in superfluid helium-4
| Autor: | J. W. Halley, Clayton F. Giese, C. E. Campbell, Keith Goetz |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics General Physics and Astronomy chemistry.chemical_element Fraction (chemistry) Many-body problem Superfluidity Cross section (physics) Helium-4 chemistry Physics::Atomic and Molecular Clusters Physics::Atomic Physics Atomic physics Helium Superfluid helium-4 Beam (structure) |
| Zdroj: | Physical Review Letters. 71:2429-2432 |
| ISSN: | 0031-9007 |
| DOI: | 10.1103/physrevlett.71.2429 |
| Popis: | We present a phenomenological analysis of an experiment to observe the condensate fraction of helium-4 by firing low-energy pulses of helium atoms at suspended droplets of the superfluid and observing the resulting emission of helium atoms from the fluid. Emission occurs through a conventional process in which rotons are produced and propagate to the other side of the droplet, and through a second process depending on the existence of the condensate. If A is the area of the incoming beam, the cross section scales with A 2 (first process) and A 4 (second process), respectively, for small A. Aspects of a full many body calculation and the performance of such an experiment are briefly discussed |
| Databáze: | OpenAIRE |
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