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Measurement of the 2νββ decay rate and spectral shape of 100Mo from the CUPID-Mo experiment

Augier, C.; Barabash, A. S.; Bellini, F.; Benato, G.; Beretta, 6 M.; Berge, L.; Billard, J.; Borovlev, Yu. A.; Cardani, L.; Casali, N.; Cazes, A.; Celi, E.; Chapellier, M.; Chiesa, D.; Dafinei, I.; Danevich, F. A.; De Jesus, M.; Dixon, T.; Dumoulin, L.; ... mehr

Abstract:

Neutrinoless double beta decay (0νββ) is a yet unobserved nuclear process which would demonstrate Lepton Number violation, a clear evidence of beyond Standard Model physics. The process two neutrino double beta decay (2νββ) is allowed by the Standard Model and has been measured in numerous experiments. In this letter, we report a measurement of 2νββ decay half-life of 100Mo to the ground state of 100Ru of (7.07 ± 0.02 (stat.) ± 0.11 (syst.)) × 1018~yr by the CUPID-Mo experiment. With a relative precision of ± 1.6 \% this is the most precise measurement to date of a 2νββ decay rate in 100Mo. In addition, we constrain higher-order corrections to the spectral shape which provides complementary nuclear structure information. We report a novel measurement of the shape factor ξ3,1=0.45 ±0.03 (stat.) ±0.05 (syst.), which is compared to theoretical predictions for different nuclear models. We also extract the first value for the effective axial vector coupling constant obtained from a spectral shape study of 2νββ decay.

Zugehörige Institution(en) am KIT Institut für Astroteilchenphysik (IAP)
Institut für Prozessdatenverarbeitung und Elektronik (IPE)
Publikationstyp Forschungsbericht/Preprint
Publikationsmonat/-jahr 07.2023
Sprache Englisch
Identifikator KITopen-ID: 1000167447
HGF-Programm 51.13.01 (POF IV, LK 01) Neutrinophysik und Dunkle Materie
Verlag arxiv
Schlagwörter Nuclear Experiment (nucl-ex), High Energy Physics - Experiment (hep-ex)
Nachgewiesen in Dimensions

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Originalveröffentlichung
DOI: 10.48550/arXiv.2307.14086
Seitenaufrufe: 30
seit 19.01.2024
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