| Autor: |
P Hautojarvi, M T Loponen, K Rytsola |
| Rok vydání: |
1976 |
| Předmět: |
|
| Zdroj: |
Journal of Physics B: Atomic and Molecular Physics. 9:411-421 |
| ISSN: |
0022-3700 |
| Popis: |
Accurate positron lifetime measurements have been performed in liquid helium-4 under saturated vapour pressure between 4.2K and 1.5K. The annihilation rate of free positrons is found to be proportional to the density of helium, indicating that no clustering of atoms occurs around the positrons. The lifetime of the orthopositronium varies from 99.1 ns to 9.14 ns. The structure of the positronium bubble is studied by combining the measured pick-off rates of the orthopositronium with the existing 2 gamma angular correlation data on the parapositronium. Both the bubble radius and the depth of the potential well inside the bubble are determined from experimental results. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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