Ford, Conor (2025) Modelling Delayed Electron Emission in XENONnT. Master's Thesis / Essay, Physics.
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Abstract
Recent improvements in background mitigation in XENONnT have made it one of the most sensitive experiments worldwide for the direct detection of dark matter. This has extended the search into lower-mass regions, in the order of keV, where new backgrounds become prominent. Among these is single-electron emission, a prominent background of all dual-phase time projection chambers, which can mimic the signal pattern of low-mass dark matter particles. In particular, there exists a delayed emission component which continues for O(s) after large signals in the detector, greatly hindering this search. This work utilises a new method of modelling this background, first developed in Ref. [1], in order to best understand the rate of this delayed electron emission. A new method of data selection is developed in order to maximise the purity of the results. This work develops extensions to the model in the form of a radial function and a numerical count of electrons per signal, and tests these extensions against the original model. This model shows much promise in helping to lower the background limit in the low-mass regime, and would also likely find applicability in other dual-phase time projection chambers.
| Item Type: | Thesis (Master's Thesis / Essay) |
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| Supervisor name: | Aalbers, J. |
| Degree programme: | Physics |
| Thesis type: | Master's Thesis / Essay |
| Language: | English |
| Date Deposited: | 21 Nov 2025 14:25 |
| Last Modified: | 21 Nov 2025 14:25 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/37141 |
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