Comparison with predictions for  Double beta decay  Recent results

Matrix elements

The calculation of the nuclear matrix elements for all three modes is quite elaborate. Until recently the most popular method was quasi random phase approximation (QRPA). It is computationally simple. Although crudely, it is believed to include all relevant features of the nuclear structure. Now, in addition, realistic shell model calculations have been performed for a few nuclei. In principle they should describe the nucleus in more details.