Precise measurement of 2vbetabeta decay of 100Mo with the CUPID-Mo detection technology

E. Armengaud (1) , C. Augier (2) , A.S. Barabash , F. Bellini , G. Benato , A. Benoît (3) , M. Beretta , L. Bergé (4) , J. Billard (2) , Yu.A. Borovlev , Ch. Bourgeois (5) , M. Briere (5) , V. Brudanin , P. Camus (6) , L. Cardani , N. Casali , A. Cazes (2) , M. Chapellier (4) , F. Charlieux (2) , M. de Combarieu (7) , I. Dafinei , F.A. Danevich , M. de Jesus (2) , L. Dumoulin (4) , K. Eitel , E. Elkhoury (2) , F. Ferri (1) , B.K. Fujikawa , J. Gascon (2) , L. Gironi , A. Giuliania (4) , V.D. Grigorieva , M. Gros (1) , E. Guerard (5) , D.L. Helis (1) , H.Z. Huang , R. Huang , J. Johnston , A. Juillard (2) , H. Khalife (4) , M. Kleifges , V.V. Kobychev , Yu.G. Kolomensky , S.I. Konovalov , A. Leder , J. Kotila , P. Loaiza (5) , L. Ma , E.P. Makarov , P. de Marcillac (4) , L. Marini , S. Marnieros (4) , D. Misiak (2) , X-F. Navick (1) , C. Nones (1) , V. Novati (4) , E. Olivieri (4) , J.L. Ouellet , L. Pagnanini , P. Pari (7) , L. Pattavina , B. Paul (1) , M. Pavan , H. Peng , G. Pessina , S. Pirro , D.V. Poda (4) , O.G. Polischuk , E. Previtali , Th. Redon (4) , S. Rozov , C. Rusconi , V. Sanglard (2) , K. Schäffner , B. Schmidt , Y. Shen , V.N. Shlegel , B. Siebenborn , V. Singh , C. Tomei , V.I. Tretyak , V.I. Umatov , L. Vagneron (2) , M. Velázquez (8) , M. Weber , B. Welliver , L. Winslow , M. Xue , E. Yakushev , A.S. Zolotarova (1, 4)

1 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
2 IP2I Lyon - Institut de Physique des 2 Infinis de Lyon
3 NEEL - HELFA - Hélium : du fondamental aux applications
4 CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière
5 LAL - Laboratoire de l'Accélérateur Linéaire
6 NEEL - Cryo - Cryogénie
7 IRAMIS - Institut Rayonnement Matière de Saclay (DRF)
8 SIMaP - Science et Ingénierie des Matériaux et Procédés

We report the measurement of the two-neutrino double-beta ($2\nu \beta \beta $) decay of $^{100}$Mo to the ground state of $^{100}$Ru using lithium molybdate ($\hbox {Li}_2^{\;\;100}\hbox {MoO}_4$) scintillating bolometers. The detectors were developed for the CUPID-Mo program and operated at the EDELWEISS-III low background facility in the Modane underground laboratory (France). From a total exposure of 42.235 kg$\times $day, the half-life of $^{100}$Mo is determined to be $T_{1/2}^{2\nu }=[7.12^{+0.18}_{-0.14}\,\mathrm {(stat.)}\pm 0.10\,\mathrm {(syst.)}]\times 10^{18}$ years. This is the most accurate determination of the $2\nu \beta \beta $ half-life of $^{100}$Mo to date.

Mots clés: S076H2N

Domaines: Physique Nucléaire Expérimentale [nucl-ex]; Instrumentations et Détecteurs [physics.ins-det]

E. Armengaud, C. Augier, A.S. Barabash, F. Bellini, G. Benato, et al.. Precise measurement of 2vbetabeta decay of 100Mo with the CUPID-Mo detection technology. Eur.Phys.J.C, 2020, 80 (7), pp.674. ⟨10.1140/epjc/s10052-020-8203-4⟩. ⟨hal-02459811⟩