Nuclear matrix elements for 0νββ decays with light or heavy Majorana-neutrino exchange
Hyvärinen, J., & Suhonen, J. (2015). Nuclear matrix elements for 0νββ decays with light or heavy Majorana-neutrino exchange. Physical Review C, 91 (2), 024613. doi:10.1103/PhysRevC.91.024613
Published inPhysical Review C
© 2015 American Physical Society. Published in this repository with the kind permission of the publisher.
We compute the nuclear matrix elements (NMEs) corresponding to the neutrinoless double beta (0νββ) decays of nuclei which attract current experimental interest. We concentrate on ground-state-to-ground-state decay transitions mediated by light (l-NMEs) or heavy (h-NMEs) Majorana neutrinos. The computations are done in realistic single-particle model spaces using the proton-neutron quasiparticle random-phase approximation (pnQRPA) with two-nucleon interactions based on the Bonn one-boson-exchange G matrix. Both the l-NMEs and the h-NMEs include the appropriate short-range correlations, nucleon form factors, and higher-order nucleonic weak currents. In addition, both types of NMEs are corrected for the isospin symmetry by the recently proposed method in which the particle-particle proton-neutron interaction parameter (gpp) is decomposed into isoscalar (gT =0 pp ) and isovector (gT =1 pp ) parts. A detailed analysis of the l-NMEs and the h-NMEs is performed to benchmark our computer code and to compare with other recent calculations which produce h-NMEs that are in tension with each other. ...