# Detailed studies of $^{100}$Mo two-neutrino double beta decay in NEMO-3

## TL;DR

This paper reports precise measurements of the two-neutrino double beta decay half-life of $^{100}$Mo, analyzes decay spectra with high statistics, and tests nuclear decay models and new physics scenarios.

## Contribution

It provides the most detailed spectral analysis of $^{100}$Mo double beta decay and tests the Single State Dominance model with unprecedented data quality.

## Key findings

- Measured half-life: $6.81 imes 10^{18}$ years.
- Found clear evidence supporting the Single State Dominance model.
- Set limits on Majoron-emitting decay modes and Lorentz invariance violation.

## Abstract

The full data set of the NEMO-3 experiment has been used to measure the half-life of the two-neutrino double beta decay of $^{100}$Mo to the ground state of $^{100}$Ru, $T_{1/2} = \left[ 6.81 \pm 0.01\,\left(\mbox{stat}\right) ^{+0.38}_{-0.40}\,\left(\mbox{syst}\right) \right] \times10^{18}$ y. The two-electron energy sum, single electron energy spectra and distribution of the angle between the electrons are presented with an unprecedented statistics of $5\times10^5$ events and a signal-to-background ratio of ~80. Clear evidence for the Single State Dominance model is found for this nuclear transition. Limits on Majoron emitting neutrinoless double beta decay modes with spectral indices of n=2,3,7, as well as constraints on Lorentz invariance violation and on the bosonic neutrino contribution to the two-neutrino double beta decay mode are obtained.