Cassidy, DB;
Deng, SHM;
Tanaka, HKM;
Mills, AP;
Greaves, RG;
Maruo, T;
Nishiyama, N;
(2005)
Experiments with a high-density positronium gas.
Physical Review Letters
, 95
(19)
, Article 195006. 10.1103/PhysRevLett.95.195006.
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Abstract
We have created a high-density gas of interacting positronium (Ps) atoms by irradiating a thin film of nanoporous silica with intense positron bursts and measured the Ps lifetime using a new single-shot technique. When the positrons were compressed to 3.3×1010cm-2, the apparent intensity of the orthopositronium lifetime component was found to decrease by 33%. We believe this is due to a combination of spin exchange quenching and Ps2 molecule formation associated with colliding pairs of oppositely polarized triplet positronium atoms. Our data imply an effective cross section for this process of 2.9×10-14cm-2. © 2005 The American Physical Society.
| Type: | Article |
|---|---|
| Title: | Experiments with a high-density positronium gas |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.95.195006 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.107.191802 |
| Additional information: | © 2005 The American Physical Society |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1362267 |
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