New measurement of double- β decays of Mo 100 to excited states of Ru 100 with the CUPID-Mo experiment

Journal Article · Tue Feb 28 00:00:00 EST 2023 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.107.025503· OSTI ID:1963466

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.; 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.; Kotila, J. ; Loaiza, P.; Ma, L.; Makarov, E. P.; de Marcillac, 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.

The CUPID-Mo experiment, located at Laboratoire Souterrain de Modane (France), was a demonstrator experiment for CUPID. It consisted of an array of 20 Li₂ ¹⁰⁰MoO₄ (LMO) calorimeters each equipped with a Ge light detector (LD) for particle identification. In this work, we present the result of a search for two-neutrino and neutrinoless double beta decays of ¹⁰⁰Mo to the first 0⁺ and 2⁺ excited states of ¹⁰⁰Ru using the full CUPID-Mo exposure (2.71 kg yr of LMO). We measure the half-life of 2νββ decay to the $$0^+_1$$ state as $$T^{2ν→0^+_1}_{1/2}$$ = (7.5 ± 0.8 (stat.) $$^{+0.4}_{-0.3}$$ (syst.)) × 10²⁰ yr. The bolometric technique enables measurement of the electron energies as well as the gamma rays from nuclear de-excitation and this allows us to set new limits on the two-neutrino decay to the $$2^+_1$$ state of $$T^{2ν→2^+_1}_{1/2}$$ > 4.4×10²¹ yr (90% c.i.) and on the neutrinoless modes of $$T^{0ν→2^+_1}_{1/2}$$ > 2.1×10²³ yr (90% c.i.), $$T^{0ν→0^+_1}_{1/2}$$ > 1.2 × 10²³ yr (90% c.i.). Information on the electrons spectral shape is obtained which allows us to make the first comparison of the single state (SSD) and higher state (HSD) 2νββ decay models for the $$0^+_1$$ excited state of ¹⁰⁰Ru.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• Contributing Organization: CUPID-Mo Collaboration
• Grant/Contract Number: AC02-05CH11231
• OSTI ID: 1963466
• Journal Information: Physical Review. C, Vol. 107, Issue 2; ISSN 2469-9985
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Double beta decay
Neutrinoless double beta decay
Nuclear structure & decays
Majorana neutrinos
Neutrinos
90 ≤ A ≤ 149