Final results on [Formula omitted] double beta decay to the ground state of [Formula omitted] from the NEMO-3 experiment

Using data from the NEMO-3 experiment, we have measured the two-neutrino double beta decay ( [Formula omitted]) half-life of [Formula omitted]Se as [Formula omitted] y under the single-state dominance hypothesis for this nuclear transition. The corresponding nuclear matrix element is [Formula omitte...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2018-10, Vol.78 (10), p.1-15
Main Authors: Arnold, R, Augier, C, Barabash, A. S, Basharina-Freshville, A, Blondel, S, Blot, S, Bongrand, M
Format: Article
Language:English
Subjects:
Beta decay
Half-life
Leptons
Neutrinos
Supersymmetry
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Summary:Using data from the NEMO-3 experiment, we have measured the two-neutrino double beta decay ( [Formula omitted]) half-life of [Formula omitted]Se as [Formula omitted] y under the single-state dominance hypothesis for this nuclear transition. The corresponding nuclear matrix element is [Formula omitted]. In addition, a search for neutrinoless double beta decay ( [Formula omitted]) using 0.93 kg of [Formula omitted]Se observed for a total of 5.25 y has been conducted and no evidence for a signal has been found. The resulting half-life limit of [Formula omitted] for the light neutrino exchange mechanism leads to a constraint on the effective Majorana neutrino mass of [Formula omitted], where the range reflects [Formula omitted] nuclear matrix element values from different calculations. Furthermore, constraints on lepton number violating parameters for other [Formula omitted] mechanisms, such as right-handed currents, majoron emission and R-parity violating supersymmetry modes have been set.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-018-6295-x