https://doi.org/10.1140/epjc/s10052-022-10942-5
Regular Article - Experimental Physics
Final results on the 
decay half-life limit of 
Mo from the CUPID-Mo experiment
1
Univ Lyon, Université Lyon 1, CNRS/IN2P3, IP2I-Lyon, 69622, Villeurbanne, France
2
National Research Centre Kurchatov Institute, Institute of Theoretical and Experimental Physics, 117218, Moscow, Russia
3
Dipartimento di Fisica, Sapienza Università di Roma, P.le Aldo Moro 2, 00185, Rome, Italy
4
INFN, Sezione di Roma, P.le Aldo Moro 2, 00185, Rome, Italy
5
IRFU, CEA, Université Paris-Saclay, 91191, Gif-sur-Yvette, France
6
INFN, Laboratori Nazionali del Gran Sasso, 67100, Assergi, AQ, Italy
7
Department of Physics, University of California, 94720, Berkeley, CA, USA
8
Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405, Orsay, France
9
Nikolaev Institute of Inorganic Chemistry, 630090, Novosibirsk, Russia
10
Dipartimento di Fisica, Università di Milano-Bicocca, 20126, Milan, Italy
11
INFN, Sezione di Milano-Bicocca, 20126, Milan, Italy
12
Institute for Nuclear Research, 03028, Kyiv, Ukraine
13
Institute for Astroparticle Physics, Karlsruhe Institute of Technology, 76021, Karlsruhe, Germany
14
Nuclear Science Division, Lawrence Berkeley National Laboratory, 94720, Berkeley, CA, USA
15
Gran Sasso Science Institute, 67100, L’Aquila, Italy
16
Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Fudan University, 200433, Shanghai, People’s Republic of China
17
Massachusetts Institute of Technology, 02139, Cambridge, MA, USA
18
Institute for Data Processing and Electronics, Karlsruhe Institute of Technology, 76021, Karlsruhe, Germany
19
Department of Nuclear Engineering, University of California, 94720, Berkeley, CA, USA
20
Physik Department, Technische Universität München, 85748, Garching, Germany
21
Department of Modern Physics, University of Science and Technology of China, 230027, Hefei, People’s Republic of China
22
LSM, Laboratoire Souterrain de Modane, 73500, Modane, France
23
Laboratory of Nuclear Problems, JINR, 141980, Dubna, Moscow Region, Russia
24
Department of Physics and Astronomy, Northwestern University, 60208, Evanston, IL, USA
25
Université Grenoble Alpes, CNRS, Grenoble INP, SIMAP, 38402, Saint Martin d’Héres, France
ab
andrea.giuliani@ijclab.in2p3.fr
Received:
17
February
2022
Accepted:
23
October
2022
Published online:
15
November
2022
The CUPID-Mo experiment to search for 0
decay in 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 decay experiment. CUPID-Mo was comprised of 20 enriched 
scintillating calorimeters, each with a mass of 
kg, operated at 
mK. We present here the final analysis with the full exposure of CUPID-Mo (Mo exposure of 1.47 
) used to search for lepton number violation via 0 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 Mo 0 decay half-life of 
year (stat. + syst.) at 90% CI. Under the light Majorana neutrino exchange mechanism this corresponds to an effective Majorana neutrino mass of 
eV, dependent upon the nuclear matrix element utilized.
© The Author(s) 2022
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Funded by SCOAP3. SCOAP3 supports the goals of the International Year of Basic Sciences for Sustainable Development.
