Gurung, Lokesh;
Babij, Tamara J;
Cassidy, David B;
(2021)
Fast decay of 23S1 positronium atoms in an MgO lined cavity.
EPJ Techniques and Instrumentation
, 8
, Article 3. 10.1140/epjti/s40485-020-00058-z.
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Abstract
We report experiments in which radiatively metastable 2 3S1 positronium (Ps) atoms entered a waveguide whose internal surfaces were lined with smoked magnesium oxide (MgO) powder. The waveguide was built such that time-delayed microwave radiation pulses, tuned to drive 2 3S1 → 2 3P2 transitions, could be applied to the Ps ensemble. The lifetime of 2 3S1 atoms was measured using time-delayed microwave induced decay, yielding ≈ 200 ns. This is considerably shorter than the Zeeman shifted lifetime of 1070 ns, indicating that Ps atoms in the 2 3S1 state do not survive multiple collisions with MgO nanocrystals We report experiments in which radiatively metastable 2 3S1 positronium (Ps) atoms entered a waveguide whose internal surfaces were lined with smoked magnesium oxide (MgO) powder. The waveguide was built such that time-delayed microwave radiation pulses, tuned to drive 2 3S1 → 2 3P2 transitions, could be applied to the Ps ensemble. The lifetime of 2 3S1 atoms was measured using time-delayed microwave induced decay, yielding ≈ 200 ns. This is considerably shorter than the Zeeman shifted lifetime of 1070 ns, indicating that Ps atoms in the 2 3S1 state do not survive multiple collisions with MgO nanocrystals
| Type: | Article |
|---|---|
| Title: | Fast decay of 23S1 positronium atoms in an MgO lined cavity |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1140/epjti/s40485-020-00058-z |
| Publisher version: | http://dx.doi.org/10.1140/epjti/s40485-020-00058-z |
| Language: | English |
| Additional information: | This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
| Keywords: | Positron, Positronium, Antimatter, QED, Spectroscopy |
| 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/10187081 |
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