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27 April 2024

» arxiv » 2207.09577

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New measurement of double beta decays of $^{100}$Mo to excited states of $^{100}$Ru with the CUPID-Mo experiment
CUPID-Mo Collaboration ; C. Augier ; A. S. Barabash ; F. Bellini ; G. Benato ; M. Beretta ; L. Bergé ; J. Billard ; Yu. A. Borovlev ; L. Cardani ; N. Casali ; A. Cazes ; M. Chapellier ; D. Chiesa ; I. Dafinei ; F. A. Danevich ; M. De Jesus ; T. Dixon ; L. Dumoulin ; K. Eitel ; F. Ferri ; B. K. Fujikawa ; J. Gascon ; L. Gironi ; A. Giuliani ; V. D. Grigorieva ; M. Gros ; D. L. Helis ; H. Z. Huang ; R. Huang ; L. Imbert ; J. Johnston ; A. Juillard ; H. Khalife ; M. Kleifges ; V. V. Kobychev ; Yu. G. Kolomensky ; S.I. Konovalov ; J. Kotilla ; P. Loaiza ; L. Ma ; E. P. Makarov ; P. de Marcillac ; R. Mariam ; L. Marini ; S. Marnieros ; X.-F. Navick ; C. Nones ; E. B. Norman ; E. Olivieri ; J. L. Ouellet ; L. Pagnanini ; L. Pattavina ; B. Paul ; M. Pavan ; H. Peng ; G. Pessina ; S. Pirro ; D. V. Poda ; O. G. Polischuk ; S. Pozzi ; E. Previtali ; Th. Redon ; A. Rojas ; S. Rozov ; V. Sanglard ; J. A. Scarpaci ; B. Schmidt ; Y. Shen ; V. N. Shlegel ; V. Singh ; C. Tomei ; V. I. Tretyak ; V. I. Umatov ; L. Vagneron ; M. Velázquez ; B. Welliver ; L. Winslow ; M. Xue ; E. Yakushev ; M. Zarytskyy ; A. S. Zolotarova ;
Date:	20 Jul 2022
Abstract:	The CUPID-Mo experiment, located at Laboratoire Souterrain de Modane (France), was a demonstrator experiment for CUPID. It consisted of an array of 20 Li$_2^{100}$MoO$_4$ (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 $^{100}$Mo to the first 0$^+$ and $2^+$ excited states of $^{100}$Ru using the full CUPID-Mo exposure (2.71 kg$ imes$yr of LMO). We measure the half-life of $2 uetaeta$ decay to the $0^{+}_1$ state as $T_{1/2}^{2 u ightarrow 0_1^+}=7.5pm 0.8 ext{(stat.)} ^{+ 0.4}_{-0.3} ext{(syst.)} ) imes 10^{20} mathrm{yr}$. 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 $T^{2 u ightarrow 2_1^+}_{1/2}>4.4 imes 10^{21} mathrm{yr} ext{(90 % c.i.)}$ and on the neutrinoless modes of $T_{1/2}^{0 u ightarrow 2_1^+}>2.1 imes10^{23} mathrm{yr} ext{(90 % c.i.)}$, $T_{1/2}^{0 u ightarrow 0_1^+}>1.2 imes10^{23} mathrm{yr} ext{(90 % c.i.)}$. 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) $2 uetaeta$ decay models for the $0_1^+$ excited state of $^{100}$Ru.
Source:	arXiv, 2207.09577
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