Related Experiment Video
Updated: Dec 30, 2025

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
Published on: May 3, 2019
Evidence of Single State Dominance in the Two-Neutrino Double-β Decay of ^{82}Se with CUPID-0
O Azzolini1, J W Beeman2, F Bellini3,4
1INFN Laboratori Nazionali di Legnaro, I-35020 Legnaro (Padua), Italy.
Abstract:
We report on the measurement of the two-neutrino double-β decay of ^{82}Se performed for the first time with cryogenic calorimeters, in the framework of the CUPID-0 experiment. With an exposure of 9.95 kg yr of Zn^{82}Se, we determine the two-neutrino double-β decay half-life of ^{82}Se with an unprecedented precision level, T_{1/2}^{2ν}=[8.60±0.03(stat) _{-0.13}^{+0.19}(syst)]×10^{19} yr. The very high signal-to-background ratio, along with the detailed reconstruction of the background sources allowed us to identify the single state dominance as the underlying mechanism of such a process, demonstrating that the higher state dominance hypothesis is disfavored at the level of 5.5σ.
Related Concept Videos
Nuclear Stability
To hold positively charged protons together...
Atomic Nuclei: Nuclear Spin State Population Distribution
Electron Configuration of Multielectron Atoms
Atomic Nuclei: Nuclear Spin State Overview
¹³C NMR: ¹H–¹³C Decoupling
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
Nuclear Transmutation

