Abstract

We report the measurement of the two-neutrino double-beta (2nu 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 kgtimes day, the half-life of ^{100}Mo is determined to be T_{1/2}^{2nu }=[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 2nu beta beta half-life of ^{100}Mo to date.

Highlights

  • Two-neutrino double-beta (2νββ) decay and the related process of the two-neutrino double-electron capture (2νECEC) are allowed second-order processes in the Standard Model theory of electroweak interactions and are the rarest nuclear processes ever observed [1,2,3]

  • We report the measurement of the two-neutrino double-beta (2νββ) decay of 100Mo to the ground state of 100Ru using lithium molybdate (Li2100MoO4) scintillating a e-mail: andrea.giuliani@csnsm.in2p3.fr bolometers

  • The observed line shape of the 40K peak, which is broader than the lines of similar and higher energies, is consistent with the presence of two sources: an external one, far from the detectors, that contributes with a γ ray of 1461 keV only, and an internal one that deposits an additional energy of 3.2 keV corresponding to the K-shell binding energy released after the primary EC decay

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Summary

Introduction

Two-neutrino double-beta (2νββ) decay and the related process of the two-neutrino double-electron capture (2νECEC) are allowed second-order processes in the Standard Model theory of electroweak interactions and are the rarest nuclear processes ever observed [1,2,3]. Precise measurements of these processes are critical to understanding the nuclear physics governing 2νββ and to benchmarking the calculations of the beyond the Standard Model process, zeroneutrino double-beta (0νββ) decay. CUPID will use the infrastructure built for the CUORE 0νββ experiment [14], currently in operation at LNGS

Experiment
Background model
Model of the 2νββ decay
Half-life of 100Mo
Background composition
Summary
Conclusions
Full Text
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