Systematic Analysis of Double-Beta Decay Half Lives

Evaluated $2{\beta }^{-}(2\nu )$ half-lives and their systematics were reexamined in the framework of a phenomenological approach. Decay rate dependence on nuclear deformation, decay energy, shape coexistence, and forbidden transitions was observed. The following analysis showed distinct impacts of decay energy on half-lives and deformation parameters on effective nuclear matrix elements. These findings were used to predict $T_{1\mathrm{/}2}$ for 36 isotopes of interest. Present work results were compared with published data.