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Search for double-beta decay of Ca-48 in NEMO-3 and commissioning of the tracker for the SuperNEMO experiment

Vilela, C; (2014) Search for double-beta decay of Ca-48 in NEMO-3 and commissioning of the tracker for the SuperNEMO experiment. Doctoral thesis , UCL (University College London). Green open access

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Abstract

The double-beta decay of Ca-48 was analysed with data taken by the NEMO-3 experiment with 6.99 grams of isotope and 1918.5 days of live time. The half-life of the two-neutrino double-beta decay of Ca-48 was measured to be 6.4 +0.6-0.7 (stat.) +1.2-0.9 (syst.) x 1019 years, with the corresponding nuclear matrix element measured to be 0.02 +- 0.002. A lower limit of 2.0 x 1022 years was placed on the half-life of the neutrinoless mode, yielding an upper limit on the effective Majorana neutrino mass of 6.1 - 38 eV. Limits were also placed on the R-parity violating supersymmetry trilinear coupling λ'111, on right-handed current couplings λ and η, and on the coupling of the Majoron to the electron neutrino. Work in preparation for the commissioning of the tracking detector for the SuperNEMO double-beta decay experiment is described. The data acquisition and high voltage supply electronics were prepared to read 504 SuperNEMO tracker cells and successfully tested with a smaller 2 x 9 array of tracker cells. A system to supply the SuperNEMO Demonstrator with the tracking gas mixture was designed and built with stringent radon emanation requirements. The system was shown to perform well on tests with a single-cell tracker prototype.

Type: Thesis (Doctoral)
Title: Search for double-beta decay of Ca-48 in NEMO-3 and commissioning of the tracker for the SuperNEMO experiment
Open access status: An open access version is available from UCL Discovery
Language: English
Keywords: neutrino, double-beta decay, beta decay, Ca-48, 48Ca, Geiger counter, Particle physics, Tracker
UCL classification: 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/1457059
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