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Search for Neutrinoless Double-Beta Decay of $^{100}$Mo with the NEMO-3 Detector

Abstract : We report the results of a search for the neutrinoless double-$\beta$ decay (0$\nu\beta\beta$) of $^{100}$Mo, using the NEMO-3 detector to reconstruct the full topology of the final state events. With an exposure of 34.7 kg.y, no evidence for the 0$\nu\beta\beta$ signal has been found, yielding a limit for the light Majorana neutrino mass mechanism of $T_{1/2}(0\nu\beta\beta)>1.1 \times 10^{24}$ 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 $< m_{\nu} > < 0.3-0.8$ eV (90% C.L.). Constraints on other lepton number violating mechanisms of 0$\nu\beta\beta$ 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 kg.y.
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Submitted on : Monday, December 2, 2013 - 5:29:53 PM
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R. Arnold, C. Augier, J. D. Baker, A. S. Barabash, A. Basharina-Freshville, et al.. Search for Neutrinoless Double-Beta Decay of $^{100}$Mo with the NEMO-3 Detector. Physical Review D, American Physical Society, 2014, 89, pp.111101. ⟨10.1103/PhysRevD.89.111101⟩. ⟨in2p3-00912877⟩



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