Search for neutrinoless double-beta decay ofMo100with the NEMO-3 detector

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Abstract

We report the results of a search for the neutrinoless double-$\ensuremath{\beta}$ decay ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$) of $^{100}\mathrm{Mo}$, using the NEMO-3 detector to reconstruct the full topology of the final state events. With an exposure of $34.7\text{ }\text{ }\mathrm{kg}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{y}$, no evidence for the $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ signal has been found, yielding a limit for the light Majorana neutrino mass mechanism of ${T}_{1/2}(0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta})>1.1\ifmmode\times\else\texttimes\fi{}{10}^{24}$ years (90% C.L.) once both statistical and systematic uncertainties are taken into account. Depending on the nuclear matrix elements this corresponds to an upper limit on the Majorana effective neutrino mass of $⟨{m}_{\ensuremath{\nu}}⟩<0.3--0.9\text{ }\text{ }\mathrm{eV}$ (90% C.L.). Constraints on other lepton number violating mechanisms of $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ decays are also given. Searching for high-energy double electron events in all suitable sources of the detector, no event in the energy region [3.2--10] MeV is observed for an exposure of $47\text{ }\text{ }\mathrm{kg}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{y}$.

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