Abstract
A second QRPA procedure is employed to perform calculations of theMGT2ν matrix elements for several double-β transitions. It is found that higher-order QRPA corrections display a weak dependence on particle-particle strengthgpp and, in the physical region (aroundgpp=1.0), they become important by comparison with QRPA predictions. It turns out that further investigations of the higher QRPA corrections could be illuminating to obtain more stable and reliable values forMGT2ν matrix elements in this region, where they are very sensitive to the particle-particle strength. Further, we have studied the influence that higher-order QRPA corrections have on single-β transitions which enter the double-β-decay rates and we have also computed Gamow-Teller matrix elements for double-β-transitions 0i+→2f+ in the cases when these processes are allowed.
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