Contributions of different neutron pairs in different approaches for neutrinoless double-beta decay

Alberto Escuderos, Amand Faessler, Vadim Rodin, Fedor Šimkovic
2010 Journal of Physics G: Nuclear and Particle Physics  
The methods used till now to calculate the neutrinoless double beta decay matrix elements are: the Quasiparticle Random Phase Approximation (QRPA), the Shell Model (SM), the angular momentum projected Hartee-Fock-Bogoliubov approach (HFB) and the Interacting Boson Model (IBM). The different approaches are compared specifically concerning the the angular momenta and parities of the neutron pairs, which are changed into two protons by the 0νββ decay. The QRPA and SM involve about the same angular
more » ... momentum and parity neutron pairs, while the HFB is restricted to 0^+, 2^+, 4^+, ..., and IBM to 0^+ and 2^+ nucleon pairs. The differences in the seniority contributions for the QRPA and the SM are discussed.
doi:10.1088/0954-3899/37/12/125108 fatcat:dnjrb6nhu5b5rowkineigahe2u