Search for neutrinoless double-beta decay of Mo100 with the NEMO-3 detector

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Morgan, B. (Ben) ; Ramachers , Y. ; , ; HASH(0x561a138aa980) (2014)

We report the results of a search for the neutrinoless double-β decay (0νββ) of Mo100, 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 0νββ signal has been found, yielding a limit for the light Majorana neutrino mass mechanism of T1/2(0νββ)>1.1×1024 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 ⟨mν⟩<0.3–0.9  eV (90% C.L.). Constraints on other lepton number violating mechanisms of 0νββ 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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    1IPHC, ULP, CNRS/IN2P3, F-67037 Strasbourg, France

    2LAL, Univ Paris-Sud, CNRS/IN2P3, F-91405 Orsay, France

    3Idaho National Laboratory, Idaho Falls, ID 83415, U.S.A.

    4ITEP, 117218 Moscow, Russia

    5UCL, London WC1E 6BT, United Kingdom

    6University of Manchester, Manchester M13 9PL, United Kingdom

    7JINR, 141980 Dubna, Russia

    8CPPM, Universite de Marseille, CNRS/IN2P3, F-13288 Marseille, France

    9CENBG, Universite de Bordeaux, CNRS/IN2P3, F-33175 Gradignan, France

    10LPC Caen, ENSICAEN, Universite de Caen, CNRS/IN2P3, F-14050 Caen, France

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