Journal Article

The background model of the CUPID-Mo 0νββ experiment

Winslow, L., Juillard, A., Benato, G., Johnston, J., Schmidt, B., Augier, C., Gironi, L., Welliver, B., Helis, D. L., Shlegel, V. N., Eitel, K., Makarov, E. P., Loaiza, P., Grigorieva, V. D., Pozzi, S., Chiesa, D., Celi, E., Marnieros, S., Kotila, J., Pavan, M., Fujikawa, B. K., Redon, Th, Kleifges, M., Pessina, G., Vagneron, L., Billard, J., Zolotarova, A. S., Yakushev, E., Sanglard, V., Singh, V., Bellini, F., Beretta, M., Xue, M., Mariam, R., Pagnanini, L., Olivieri, E., Khalife, H., Dafinei, I., Previtali, E., Peng, H., Shen, Y., de Marcillac, P., Imbert, L., Tomei, C., Velázquez, M., Giuliani, A., Huang, R., Gascon, J., Bergé, L., Norman, E. B., Paul, B., Umatov, V. I., Rozov, S., Borovlev, Yu. A., Kolomensky, Yu. G., Pirro, S., Polischuk, O. G., Zarytskyy, M., Ma, L., Pattavina, L., Cazes, A., Konovalov, S. I., Poda, D. V., Dixon, T., Ouellet, J. L., Chapellier, M., Dumoulin, L., Huang, H. Z., Gros, M., Navick, X.-F., Cardani, L., Danevich, F. A., Barabash, A. S., Casali, N., Scarpaci, J. A., Rojas, A., Tretyak, V. I., Marini, L., Nones, C., De Jesus, M., Kobychev, V. V., Ferri, F.

2023

Overview

CUPID-Mo, located in the Laboratoire Souterrain de Modane (France), was a demonstrator for the next generation 0 ν β β decay experiment, CUPID. It consisted of an array of 20 enriched Li 2 100 MoO 4 bolometers and 20 Ge light detectors and has demonstrated that the technology of scintillating bolometers with particle identification capabilities is mature. Furthermore, CUPID-Mo can inform and validate the background prediction for CUPID. In this paper, we present a detailed model of the CUPID-Mo backgrounds. This model is able to describe well the features of the experimental data and enables studies of the 2 ν β β decay and other processes with high precision. We also measure the radio-purity of the Li 2 100 MoO 4 crystals which are found to be sufficient for the CUPID goals. Finally, we also obtain a background index in the region of interest of 3.7  - 0.8 + 0.9  (stat) - 0.7 + 1.5  (syst)  × 10 - 3  counts/ Δ E FWHM / mol iso / year , the lowest in a bolometric 0 ν β β decay experiment.

• Publisher: Springer Berlin Heidelberg,Springer Nature B.V
• Subject: Astronomy / Astrophysics and Cosmology / Bolometers / Decay / Elementary Particles / Energy / Experiments / Hadrons / Heavy Ions / Laboratories / Light / Measurement Science and Instrumentation / Nuclear Energy / Nuclear Physics / Physics / Physics and Astronomy / Quantum Field Theories / Quantum Field Theory / Regular Article - Experimental Physics / Sensors / String Theory