Approximate symmetries in nuclei and the 2ββ-decay rate
Abstract
A nonstandard method for calculating the nuclear 2ββ - decay amplitude is proposed. The method is based on the explicit use of those approximate symmetries of a nuclear hamiltonian, which correspond to the operators of allowed β -- transitions. Within the framework of the proposed method the mentioned amplitude is calculated for a wide range of nuclei. The model parameters used in calculations are taken from independent data. Calculated half-lifes are compared with known experimental data.
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