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

• Published in: The European physical journal. C, Particles and fields Particles and fields, 2022-11, Vol.82 (11), p.1033
• Main Authors: Augier, C., Barabash, A. S., Bellini, F., Benato, G., Beretta, M., Bergé, L., Billard, J., Borovlev, Yu. A., Cardani, L., Casali, N., Cazes, A., Chapellier, M., Chiesa, D., Dafinei, I., Danevich, F. A., De Jesus, M., de Marcillac, P., Dixon, T., Dumoulin, L., Eitel, K., Ferri, F., Fujikawa, B. K., Gascon, J., Gironi, L., Giuliani, A., Grigorieva, V. D., Gros, M., Helis, D. L., Huang, H. Z., Huang, R., Imbert, L., Johnston, J., Juillard, A., Khalife, H., Kleifges, M., Kobychev, V. V., Kolomensky, Yu. G., Konovalov, S. I., Loaiza, P., Ma, L., Makarov, E. P., Mariam, R., Marini, L., Marnieros, S., Navick, X.-F., Nones, C., Norman, E. B., Olivieri, E., Ouellet, J. L., Pagnanini, L., Pattavina, L., Paul, B., Pavan, M., Peng, H., Pessina, G., Pirro, S., Poda, D. V., Polischuk, O. G., Pozzi, S., Previtali, E., Redon, Th, Rojas, A., Rozov, S., Sanglard, V., Scarpaci, J. A., Schmidt, B., Shen, Y., Shlegel, V. N., Singh, V., Tomei, C., Tretyak, V. I., Umatov, V. I., Vagneron, L., Velázquez, M., Welliver, B., Winslow, L., Xue, M., Yakushev, E., Zarytskyy, M., Zolotarova, A. S.
• Format: Article
• Language: English
• Subjects: Astronomy; Astrophysics and Cosmology; Decay; Elementary Particles; Experiments; Hadrons; Half-life; Heavy Ions; Leptons; Measurement Science and Instrumentation; Neutrinos; Nuclear Energy; Nuclear Physics; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Regular Article - Experimental Physics; Reprocessing; String Theory
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-022-10942-5

The CUPID-Mo experiment to search for 0 ν β β 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 ν β β decay experiment. CUPID-Mo was comprised of 20 enriched Li 2 100 MoO 4 scintillating calorimeters, each with a mass of ∼ 0.2  kg, operated at ∼ 20  mK. We present here the final analysis with the full exposure of CUPID-Mo ( 100 Mo exposure of 1.47 kg × year ) used to search for lepton number violation via 0 ν β β 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 ν β β decay half-life of T 1 / 2 0 ν > 1.8 × 10 24  year (stat. + syst.) at 90% CI. Under the light Majorana neutrino exchange mechanism this corresponds to an effective Majorana neutrino mass of m β β   < ( 0.28 - 0.49 )  eV, dependent upon the nuclear matrix element utilized.