Evidence for nonexistence of self-trapped positronium in KI at very low temperatures
- 15 October 1989
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 40 (11) , 8037-8040
- https://doi.org/10.1103/physrevb.40.8037
Abstract
The polarization effect of a magnetic field on the positronium components in the one-dimensional angular correlation of annihilation radiation in KI has been investigated. It has been confirmed that practically all positronium atoms annihilate from the free states at 15 K. Rapid increase in the fraction of the positronium atoms annihilating from the self-trapped state with increasing temperature is also confirmed. An interpretation of the results is given in terms of the metastable self-trapping of positronium suggested previously. The self-trapping of positronium is discussed in connection with that of excitons.Keywords
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