Improved description of the $2\nu \beta \beta$-decay and a possibility to determine the effective axial-vector coupling constant

Fedor Šimkovic, Rastislav Dvornický, Dušan Štefánik +1

An improved formalism of the two-neutrino double-beta decay ($2\nu \beta \beta$-decay) rate is presented, which takes into account the dependence of energy denominators on lepton energies via…