Sheldon, RE;
Babij, TJ;
Devlin-Hill, BA;
Gurung, L;
Cassidy, DB;
(2020)
Measurement of the annihilation decay rate of 2³S₁ positronium.
EPL (Europhysics Letters)
, 132
(1)
, Article 13001. 10.1209/0295-5075/132/13001.
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Abstract
We report a measurement of the annihilation decay rate of 2 3S1 positronium (Ps) atoms, Γexp(2 3S1). Ground state atoms optically excited to radiatively metastable 2 3S1 states were quenched via Stark mixing by the application of a time-delayed electric field. Rapid radiative decay of the Stark mixed states to the ground state, followed by self-annihilation, was observed via the annihilation radiation time spectrum, and used to determine the number of excited state atoms remaining at different times, and hence the decay rate. We obtain Γexp(2 3S1) = 843 ± 72 kHz, in broad agreement with the Zeeman-shifted theoretical value of 890 kHz.
| Type: | Article |
|---|---|
| Title: | Measurement of the annihilation decay rate of 2³S₁ positronium |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1209/0295-5075/132/13001 |
| Publisher version: | https://doi.org/10.1209/0295-5075/132/13001 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| 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-pp.ucl.ac.uk/id/eprint/10122953 |
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