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Title: Double beta decay of ¹⁵⁰Nd in NEMO-III and studies towards the design of SuperNEMO
Author: Jackson, Christopher M.
Awarding Body: University of Manchester
Current Institution: University of Manchester
Date of Award: 2011
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The observation of neutrinoless double beta decay is the only experimentally feasible method to determine the Majorana nature of light neutrinos. The currently running NEMO-III experiment has measured two neutrino double beta decay and has produced the world’s best limits on the neutrino less double beta decay for several isotopes. The two neutrino half life of 150Nd was measured to be T1/2 = (8.78+0.21 −0.19) · 1018 y. (1) The next generation experiment SuperNEMO, containing the source isotopes of 82Se and 150Nd, was simulated. Assuming 500 kg y exposure the half life sensitivities were found to be: T 82Se 1/2 > 1.2 · 1026 y (90% CL), (2) T 150Nd 1/2 > 5.1 · 1025 y (90% CL). (3) This leads to sensitivity limits on effective Majorana masses of: hm 82Se º i < 62 − 114 meV (90% CL), (4) hm 150Nd º i < 130 − 168 meV (90% CL). (5) The use of electron angular and energy difference kinematics to probe the mechanism of double beta decay was demonstrated. A two isotope detector method was shown to confirm the mass mechanism by light neutrino exchange.
Supervisor: Soldner-Rembold, Stefan Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available