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arxiv: 2202.08716 · v2 · pith:MBHMKBWFnew · submitted 2022-02-17 · ⚛️ nucl-ex · physics.ins-det

Final results on the 0νββ decay half-life limit of ¹⁰⁰Mo from the CUPID-Mo experiment

C. Augier , A. S. Barabash , F. Bellini , G. Benato , M. Beretta , L. Berg\'e , J. Billard , Yu. A. Borovlev
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L. Cardani N. Casali A. Cazes M. Chapellier D. Chiesa I. Dafinei F. A. Danevich M. De Jesus P. de Marcillac T. Dixon L. Dumoulin K. Eitel F. Ferri B. K. Fujikawa J. Gascon L. Gironi A. Giuliani V. D. Grigorieva M. Gros D. L. Helis H. Z. Huang R. Huang L. Imbert J. Johnston A. Juillard H. Khalife M. Kleifges V. V. Kobychev Yu. G. Kolomensky S.I. Konovalov P. Loaiza L. Ma E. P. Makarov R. Mariam L. Marini S. Marnieros X.-F. Navick C. Nones E.B. Norman E. Olivieri J. L. Ouellet L. Pagnanini L. Pattavina B. Paul M. Pavan H. Peng G. Pessina S. Pirro D. V. Poda O. G. Polischuk S. Pozzi E. Previtali Th. Redon A. Rojas S. Rozov V. Sanglard J.A. Scarpaci B. Schmidt Y. Shen V. N. Shlegel V. Singh C. Tomei V. I. Tretyak V. I. Umatov L. Vagneron M. Vel\'azquez B. Welliver L. Winslow M. Xue E. Yakushev M. Zarytskyy A. S. Zolotarova
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classification ⚛️ nucl-ex physics.ins-det
keywords betadecaycupid-moexperimentanalysisdataexposurefinal
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The CUPID-Mo experiment to search for 0$\nu\beta\beta$ decay in $^{100}$Mo has been recently completed after about 1.5 years of operation at Laboratoire Souterrain de Modane (France). It served as a demonstrator for CUPID, a next generation 0$\nu\beta\beta$ decay experiment. CUPID-Mo was comprised of 20 enriched Li$_2$$^{100}$MoO$_4$ scintillating calorimeters, each with a mass of $\sim$ 0.2 kg, operated at $\sim$20 mK. We present here the final analysis with the full exposure of CUPID-Mo ($^{100}$Mo exposure of 1.47 kg$\times$yr) used to search for lepton number violation via 0$\nu\beta\beta$ decay. We report on various analysis improvements since the previous result on a subset of data, reprocessing all data with these new techniques. We observe zero events in the region of interest and set a new limit on the $^{100}$Mo 0$\nu\beta\beta$ decay half-life of $T^{0\nu}_{1/2} > 1.8 \times 10^{24}$ year (stat.+syst.) at 90% CI. Under the light Majorana neutrino exchange mechanism this corresponds to an effective Majorana neutrino mass of $\left<m_{\beta \beta}\right> < (0.28$--$0.49)$ eV, dependent upon the nuclear matrix element utilized.

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