A1 Journal article (refereed)
New measurement of double-β decays of 100Mo to excited states of 100Ru with the CUPID-Mo experiment (2023)

CUPID-Mo Collaboration. (2023). New measurement of double-β decays of 100Mo to excited states of 100Ru with the CUPID-Mo experiment. Physical Review C, 107(2), Article 025503. https://doi.org/10.1103/PhysRevC.107.025503

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Publication details

All authors or editors: CUPID-Mo Collaboration

Journal or series: Physical Review C

ISSN: 2469-9985

eISSN: 2469-9993

Publication year: 2023

Publication date: 28/02/2023

Volume: 107

Issue number: 2

Article number: 025503

Publisher: American Physical Society (APS)

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevC.107.025503

Publication open access: Not open

Publication channel open access: 

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/86523

Web address of parallel published publication (pre-print): https://arxiv.org/abs/2207.09577

Abstract

The CUPID-Mo experiment, located at the Laboratoire Souterrain de Modane (France), was a demonstrator experiment for CUPID. It consisted of an array of 20Li2100MoO4 (LMO) calorimeters, each equipped with a Ge light detector for particle identification. In this work, we present the result of a search for two-neutrino and neutrinoless double-β decays of 100Mo to the first 0+ and 2+ excited states of 100Ru using the full CUPID-Mo exposure (2.71kgyr of LMO). We measure the half-life of 2νββ decay to the 0+1 state as T2ν→0+11/2=(7.5±0.8(stat.)+0.4−0.3(syst.))×1020yr. The bolometric technique enables measurement of the electron energies as well as the γ rays from nuclear deexcitation and this allows us to set new limits on the two-neutrino decay to the 2+1 state of T2ν→2+11/2>4.4×1021yr(90% c.i.) and on the neutrinoless modes of T0ν→2+11/2>2.1×1023yr(90% c.i.), T0ν→0+11/2>1.2×1023yr(90% c.i.). Information on the electrons' spectral shape is obtained, which allows us to make the first comparison of the single and higher state dominance 2νββ decay models for the 0+1 excited state of 100Ru.

Keywords: nuclear physics

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Ministry reporting: Yes

VIRTA submission year: 2023

JUFO rating: 2