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Title: Construction and commissioning of the tracker for the SuperNEMO Demonstrator Module and unfolding the 2νββ spectrum of 100Mo from the NEMO-3 experiment
Author: Chopra, Ashwin Kumar
ISNI:       0000 0004 8499 8428
Awarding Body: UCL (University College London)
Current Institution: University College London (University of London)
Date of Award: 2019
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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.
Supervisor: Waters, D. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available