New Results from the NEMO 3 Experiment

TL;DR

The NEMO 3 experiment has set new limits on neutrinoless double beta decay and measured two-neutrino decay half-lives for multiple isotopes, providing important data for neutrino physics research.

Contribution

This paper reports new experimental limits on neutrinoless double beta decay and precise measurements of two-neutrino decay half-lives for seven isotopes, based on two years of data from NEMO 3.

Findings

Limit on neutrinoless double beta decay: T_{1/2}^{0 u} > 5.8×10^{23} years

Measured two-neutrino double beta decay half-lives for seven isotopes

New half-life results for ^{48}Ca and ^{96}Zr isotopes

Abstract

NEMO 3 is a currently running experiment to search for the neutrinoless double beta decay and to study the two-neutrino double beta decay with 10kg of enriched isotopes. On the basis of the first two years of data taking, a limit on the neutrinoless decay $T_{1/2}^{0\nu} > 5.8\cdot10^{23}$ y at 90% CL was obtained with $^{100}Mo$. The two-neutrino double beta decay half-lives were measured for all seven $\beta\beta$ isotopes located in NEMO 3. New results are obtained for two of these isotopes: $^{48}Ca T_{1/2}^{2\nu}=[4.4 ^{+0.5}_{-0.4} (stat) \pm 0.4 (syst)]\cdot10^{19}$ y, $^{96}Zr T_{1/2}^{2\nu}=[2.3 \pm 0.2 (stat) \pm 0.3 (syst)]\cdot10^{19}$ y.