| EPSRC Reference: |
GR/L29149/01 |
| Title: |
ROTON QUANTUM EVAPORATION |
| Principal Investigator: |
Wyatt, Professor A |
| Other Investigators: |
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| Department: |
Physics |
| Organisation: |
University of Exeter |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
01 January 1997 |
Ends: |
31 December 1999 |
Value (£): |
238,151
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Summary on Grant Application Form |
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With the development of credible models of Quantum Evaporation which are producing quantitative predictions of the probability of the various excitation-atom processes, there is a need for new experiments that can provide data to compare with theory. Beams of ballistic rotons can be created but their flux cannot be measured, so the probability of evaporation cannot be deduced. We propose an experiment in which atoms are directed at a 'free standing' slab of liquid helium and the atoms which are evaporated from the far side, are detected. The condensing atoms produce rotons which propagate ballistically across the slab and evaporate atoms on the far side. As the probability of the atom-roton process is the same as that for roton to atom we do not need to measure the intermediate roton flux. We also propose to develop a black-body source of rotons, characterise it, and then use it to establish the existence of R-rotons and their quantum evaporation. The lack of evidence for ballistic R-rotons is a major enigma. Ripplon production is a competing process to evaporation and we propose an experiment to measure it.
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Key Findings |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Potential use in non-academic contexts |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Impacts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
| Summary |
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| Date Materialised |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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| Project URL: |
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| Further Information: |
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| Organisation Website: |
http://www.ex.ac.uk |