Kadokura, Rina;
(2021)
Electron, positron and positronium cross sections.
Doctoral thesis (Ph.D), UCL (University College London).
Preview |
Text
Kadokura_10133613_thesis_redacted.pdf Download (34MB) | Preview |
Abstract
The work in this thesis concerns cross section measurements involving electron, positron, and positronium (Ps) projectiles and their interactions with different atomic and molecular targets. Two different positron beam lines have been employed for these studies: an electrostatic system for generating an electron beam and a magnetic system for producing a Ps beam. The UCL electrostatic beam has been used to measure the total cross section for electron scattering from water vapour, with an angular acceptance of ∼ 1º), in the energy range (3 - 100) eV. These results are presented and compared with previous experimental and theoretical determinations. The effect and significance of forward elastic scattering have also been investigated, with results consistent with previous measurements of similar angular resolutions. The magnetic positron beam was utilized to determine the collimated Ps production efficiency, differential Ps formation and Ps total scattering cross section. The Ps beam production efficiency has been measured for He and Ne in the energy range (7 - 60) eV and (9 - 150) eV, respectively. The total cross section has been measured for (Ps + He) scattering in the energy range (10 - 75) eV. The current results of the two, along with previous data have been used to extract the differential Ps formation cross section near zero degrees for He and Ne in the positron energy range (7 - 110) eV and (10 - 100) eV, respectively. The electron-like behaviour of equivelocity Ps has also been examined for a variety of targets, including molecular oxygen which displays a significant deviation at the lowest energies investigated (below 30 eV).
| Type: | Thesis (Doctoral) |
|---|---|
| Qualification: | Ph.D |
| Title: | Electron, positron and positronium cross sections |
| Event: | UCL (University College London) |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | Copyright © The Author 2021. Original content in this thesis is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) Licence (https://creativecommons.org/licenses/by-nc/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request. |
| 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/10133613 |
Loading...
Loading...Loading...Loading...Archive Staff Only
 |
View Item |
