Nuclear matrix elements for neutrinoless double-beta decay and double-electron capture

作者：Faessler Amand^*; Rodin Vadim; Simkovic Fedor

来源：Journal of Physics G: Nuclear and Particle Physics , 2012, 39(12): 124006.

DOI：10.1088/0954-3899/39/12/124006

A new generation of neutrinoless double-beta decay (0 nu beta beta-decay) experiments with improved sensitivity is currently being designed and under construction. They will probe the inverted hierarchy region of the neutrino mass pattern. There is also a revived interest in the resonant neutrinoless double-electron capture (0 nu ECEC), which also has the potential to probe lepton number conservation and to investigate the neutrino nature and mass scale. The primary concerns are the nuclear matrix elements. Clearly, the accuracy of the determination of the effective Majorana neutrino mass from the measured 0 nu beta beta-decay half-life is mainly determined by our knowledge of the nuclear matrix elements. We review recent progress achieved in the calculation of 0 nu beta beta and 0 nu ECEC nuclear matrix elements within the quasiparticle random phase approximation. A considered self-consistent approach allows us to derive the pairing, residual interactions and the two-nucleon short-range correlations from the same modern realistic nucleon-nucleon potentials. The effect of nuclear deformation is taken into account. The possibility of evaluating 0 nu beta beta-decay matrix elements phenomenologically is discussed.

• 出版日期2012-12