ARNOLD, R.; AUGIER, C.; BAKER, J.D.; BARABASH, A.S.; BASHARINA-FRESHVILLE, A.; BLONDEL, S.; BLOT, S.; BONGRAND, M.; BRUDANIN, V.; BUSTO, J.; CAFFREY, A.J.; CALVEZ, S.; CASCELL, M.; CERNA, C.; CESAR, J.P.; CHAPON, A.; CHAUVEAU, E.; CHOPRA, A.; DUCHESNEAU, D.; DURAND, D.; EGOROV, V.; EURIN, G.; EVANS, J.J.; FAJT, L.; FILOSOFOV, D.; FLACK, R.; GARRIDO, X.; GÒMEZ, H.; GUILLON, B.; GUZOWSKI, P.; HODÁK, R.; HUBER, A.; HUBERT, P.; HUGON, C.; JULLIAN, S.; KLIMENKO, A.; KOCHETOV, O.; KONOVALOV, S.I.; KOVALENKO, V.; LALANNE, D.; LANG, K.; LEMIÈRE, Y.; LE NOBLET, T.; LIPTAK, Z.; LIU, X.R.; LOAIZA, P.; LUTTER, G.; MAMEDOV, F.; MARQUET, C.; MAUGER, F.; MORGAN, B.; MOTT, J.; NEMCHENOK, I.; NOMACHI, M.; NOVA, F.; NOWACKI, F.; OHSUMI, H.; PAHLKA, R.B.; PERROT, F.; PIQUEMAL, F.; POVINEC, P.; PŘIDAL, P.; RAMACHERS, Y.A.; REMOTO, A.; REYSS, J.L.; RICHARDS, B.; RIDDLE, C.L.; RUKHADZE, E.; SAAKYAN, R.; SALAZAR, R.; SARAZIN, X.; SHITOV, Yu.; SIMARD, L.; ŠIMKOVIC, F.; SMETANA, A.; SMOLEK, K.; SMOLNIKOV, A.; SOLDNER-REMBOLD, S.; SOULÉ, B.; ŠTEKL, I.; SUHONEN, J.; SUTTON, C.S.; SZKLARZ, G.; THOMAS, J.; TIMKIN, V.; TORRE, S.; TRETYAK, Vl. I.; TRETYAK, V.I.; UMATOV, V.I.; VANUSHIN, I.; VILELA, C.; VOROBEL, V.; WATERS, D.; ŽUKAUSKAS, A.

doi:10.1103/PhysRevD.94.072003

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ARNOLD, R.
Institut Pluridisciplinaire Hubert Curien [IPHC]

AUGIER, C.
Laboratoire de l'Accélérateur Linéaire [LAL]

BAKER, J.D.

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Physical Review D. 2016, vol. 94, n° 7, p. 072003

American Physical Society

Résumé en anglais

We present results from a search for neutrinoless double-β (0νββ) decay using 36.6 g of the isotope Nd150 with data corresponding to a live time of 5.25 y recorded with the NEMO-3 detector. We construct a complete background model for this isotope, including a measurement of the two-neutrino double-β decay half-life of T1/22ν=[9.34±0.22(stat) -0.60+0.62(syst)]×1018 y for the ground state transition, which represents the most precise result to date for this isotope. We perform a multivariate analysis to search for 0νββ decays in order to improve the sensitivity and, in the case of observation, disentangle the possible underlying decay mechanisms. As no evidence for 0νββ decay is observed, we derive lower limits on half-lives for several mechanisms involving physics beyond the standard model. The observed lower limit, assuming light Majorana neutrino exchange mediates the decay, is T1/20ν>2.0×1022 y at the 90% C.L., corresponding to an upper limit on the effective neutrino mass of ⟨mν⟩<1.6–5.3 eV.< Réduire

Mots clés en anglais

23.40.-s

14.60.Pq

neutrino: mass

neutrino: Majorana

neutrino: exchange

ground state: transition

background: model

double-beta decay: (0neutrino)

experimental results

sensitivity

numerical calculations

Monte Carlo

new physics

Neutrino Ettore Majorana Observatory

S076H2N

S076MW

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Measurement of the 2$\nu\beta\beta$ decay half-life of $^{150}$Nd and a search for 0$\nu\beta\beta$ decay processes with the full exposure from the NEMO-3 detector

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