Result of the search for neutrinoless double-β decay in ¹⁰⁰Mo with the NEMO-3 experiment

R. Arnold , C. Augier , J.D. Baker , A.S. Barabash , A. Basharina-Freshville , S. Blondel , S. Blot , M. Bongrand

show 82 more authors

V. Brudanin J. Busto A.J. Caffrey S. Calvez C. Cerna J.P. Cesar A. Chapon E. Chauveau D. Duchesneau D. Durand V. Egorov G. Eurin J.J. Evans L. Fajt D. Filosofov R. Flack X. Garrido H. G\'omez B. Guillon P. Guzowski R. Hod\'ak A. Huber P. Hubert C. Hugon S. Jullian A. Klimenko O. Kochetov S.I. Konovalov V. Kovalenko D. Lalanne K. Lang Y. Lemi\`ere T. Le Noblet Z. Liptak P. Loaiza G. Lutter F. Mamedov C. Marquet F. Mauger B. Morgan J. Mott I. Nemchenok M. Nomachi F. Nova F. Nowacki H. Ohsumi R.B. Pahlka F. Perrot F. Piquemal P. Povinec P. P\v{r}idal Y.A. Ramachers A. Remoto J.L. Reyss B. Richards C.L. Riddle E. Rukhadze R. Saakyan X. Sarazin Yu. Shitov L. Simard F. Simkovic A. Smetana K. Smolek A. Smolnikov S. S\"oldner-Rembold B. Soul\'e I. \v{S}tekl J. Suhonen C.S. Sutton G. Szklarz J. Thomas V. Timkin S. Torre Vl.I. Tretyak V.I. Tretyak V.I. Umatov I. Vanushin C. Vilela V. Vorobel D. Waters A. \v{Z}ukauskas (NEMO-3 Collaboration)

Authors on Pith no claims yet

classification ✦ hep-ex nucl-exphysics.ins-det

keywords betadecaysnemo-3searchbackgrounddatadecaydetector

0 comments

read the original abstract

The NEMO-3 detector, which had been operating in the Modane Underground Laboratory from 2003 to 2010, was designed to search for neutrinoless double $\beta$ ($0\nu\beta\beta$) decay. We report final results of a search for $0\nu\beta\beta$ decays with $6.914$ kg of $^{100}$Mo using the entire NEMO-3 data set with a detector live time of $4.96$ yr, which corresponds to an exposure of 34.3 kg$\cdot$yr. We perform a detailed study of the expected background in the $0\nu\beta\beta$ signal region and find no evidence of $0\nu\beta\beta$ decays in the data. The level of observed background in the $0\nu\beta\beta$ signal region $[2.8-3.2]$ MeV is $0.44 \pm 0.13$ counts/yr/kg, and no events are observed in the interval $[3.2-10]$ MeV. We therefore derive a lower limit on the half-life of $0\nu\beta\beta$ decays in $^{100}$Mo of $T_{1/2}(0\nu\beta\beta)> 1.1 \times 10^{24}$ yr at the $90\%$ Confidence Level, under the hypothesis of light Majorana neutrino exchange. Depending on the model used for calculating nuclear matrix elements, the limit for the effective Majorana neutrino mass lies in the range $\langle m_{\nu} \rangle < 0.33$--$0.62$ eV. We also report constraints on other lepton-number violating mechanisms for $0\nu\beta\beta$ decays.

This paper has not been read by Pith yet.

Result of the search for neutrinoless double-β decay in ¹⁰⁰Mo with the NEMO-3 experiment

discussion (0)