Comprehensive Review of 2$\beta$ Decay Half-Lives

Abstract

The double-beta (2$\beta$)-decay is the rarest nuclear physics process, and its experimental half-lives (T${}_{1/2}$) exceed the age of the Universe from nine to fourteen orders of magnitude. Double-beta decay was observed, and its half-life was measured in 14 parent nuclei using direct, radiochemical, and geochemical methods. The decay observables are analyzed using the Evaluated Nuclear Structure Data File (ENSDF) procedures, and the recommended T${}_{1/2}$ were deduced. Using the calculated values of phase factors, the effective nuclear matrix elements were extracted and compared with available data. Thousands of theoretical and experimental works have been dedicated to these topics in the last 85 years, and we present two data sets of recommended values to encapsulate the results.

63 pages, 16 figures, 6 tables

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• CUPID, the CUORE Upgrade with Particle IDentification
• Pathfinding Quantum Simulations of Neutrinoless Double-Beta Decay