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Construction and commissioning of the tracker for the SuperNEMO Demonstrator Module and Unfolding the 2νββ spectrum of 100Mo from the NEMO-3 experiment

Chopra, Ashwin Kumar; (2019) Construction and commissioning of the tracker for the SuperNEMO Demonstrator Module and Unfolding the 2νββ spectrum of 100Mo from the NEMO-3 experiment. Doctoral thesis (Ph.D), UCL (University College London). Green open access

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Abstract

The SuperNEMO experiment will search for the neutrinoless double beta decay of 82Se, with an expected half-life sensitivity of >10^26 years. The first stage of the experiment, the SuperNEMO Demonstrator Module, is expected to achieve a half-life sensitivity of 6.6×10^24 years after running for 2.5 years with 7 kg of source isotope. Key results from the construction, and commissioning of the wire tracker for the Demonstrator Module are described, and the drift distance-time relationship of each of the first three quarters measured. The two-neutrino double-beta decay half-life of 100Mo has been measured as 7.01±0.01(stat)±0.46\(syst)×10^18 years using a sample of 6914 g of isotope measured for 5.25 years by the precursor experiment, NEMO-3. The summed electron energy spectrum was unfolded, allowing for a limit of -1.12×10^-1 < å³_of < 6.95×10^-2 MeV to be placed on the Lorentz Violating operator å³_of. A further unfolded distribution in the three dimensions of summed energy, energy asymmetry, and the opening angle of the emitted electrons has been produced, allowing subsequent experiment-agnostic analyses.

Type: Thesis (Doctoral)
Qualification: Ph.D
Title: Construction and commissioning of the tracker for the SuperNEMO Demonstrator Module and Unfolding the 2νββ spectrum of 100Mo from the NEMO-3 experiment
Event: UCL (University College London)
Open access status: An open access version is available from UCL Discovery
Language: English
Additional information: Copyright © The Author 2019. Original content in this thesis is licensed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) Licence (https://creativecommons.org/licenses/by/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 > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/10070180
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