Basharina-Freshville, A.; (2012) Search for the neutrinoless double beta decay of 100Mo with the NEMO3 detector and calorimeter research and development for the SuperNEMO experiment. Doctoral thesis , UCL (University College London).

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Abstract

The world’s most precise half-life measurement of T^2nu_1/2 = [7.02 ± 0.01(stat) ± 0.46(syst)] × 10^18 years has been made for the 2\nu��\beta\beta decay of ^100Mo using data from 6.9kg collected with the NEMO3 detector over 1471 days. The 2\nu nuclear matrix element has been extracted using T^2nu_1/2 and is M^2\nu = 0.126 ± 0.004. The 0\nu��\beta\beta search yielded a limit on the half-life of T^0\nu_1/2 1/1 > 1.1 × 10^24 years at the 90% CL, corresponding to a limit on the effective Majorona mass of \langle M\nu e\rangle < 0.3 - 1.0eV, one of the most stringent constraints on \langle M\nu e\rangle in the world. Limits on the right-handed currents and Majoron 0\nu��\beta\beta modes have also been set. The world’s most stringent bound has been set on the Majoron to neutrino coupling constant of \langle g \chi o \rangle < (0.2 − 0.7) × 10^−4. SuperNEMO is a next generation ��\beta\beta decay experiment, based on the design and experience of NEMO3. Due to start demonstrator operation in 2013, SuperNEMO aims to achieve a sensitivity of 10^26 years, corresponding to \langle M\nu e\rangle < 50-100meV using ^82Se. An alternative to the baseline calorimeter design was considered, using 2m x 10cm x 2.54cm scintillator bars. An energy resolution of 10% FWHM at 1 MeV and a time resolution of ~ 450ps was achieved for the alternative design. This is an unprecedented energy resolution for a scintillator of this size.

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