EPJ Web Conf.
Volume 194, 2018International Conference on Nuclear Structure and Related Topics (NSRT18)
|Number of page(s)||6|
|Section||Spin-isospin excitations and beta-decay|
|Published online||14 November 2018|
Two neutrino double-beta decay and effective axial-vector coupling constant
Comenius University, Mlynská dolina F1, SK-842 48 Bratislava, Slovakia
2 Dzhelepov Laboratory of Nuclear Problems, JINR, 141980 Dubna, Russia
3 Bogoliubov Laboratory of Theoretical Physics, JINR, 141980 Dubna, Russia
4 Czech Technical University in Prague, 128-00 Prague, Czech Republic
Published online: 14 November 2018
The theoretical and experimental study of the two-neutrino double-beta decay (2νββ-decay) is of crucial importance for reliable calculation of matrix elements governing the neutrinoless double-beta decay (0νββ-decay). That will allow to determine masses of neutrinos once the 0νββ-decay, which occurs if the neutrino is a massive Majorana particle and the total lepton number is not onserved, will be observed. Experiments studying the 2νββ-decay are currently approaching a qualitatively new level, where high-precision measurements are performed not only for half-lives but for all other observables of the process. In this context an improved formula for the 2νββ-decay is presented. Further, a novel approach for determining the effective axial-vector coupling constant is proposed.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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