Neutrinoless ββ nuclear matrix elements using isovector spin-dipole Jπ = 2− data
Jokiniemi, L., Ejiri, H., Frekers, D., & Suhonen, J. (2018). Neutrinoless ββ nuclear matrix elements using isovector spin-dipole Jπ = 2− data. Physical Review C, 98(2), Article 024608. https://doi.org/10.1103/PhysRevC.98.024608
Published inPhysical Review C
© 2018 American Physical Society
Ground-state-to-ground-state neutrinoless double-beta (0νββ) decays in nuclei of current experimental interest are revisited. In order to improve the reliability of the nuclear matrix element (NME) calculations for the light Majorana-neutrino mode, the NMEs are calculated by exploiting the newly available data on isovector spin-dipole (IVSD) Jπ=2− giant resonances. In order to correctly describe the IVSD up to and beyond the giant-resonance region, the present computations are performed in extended no-core single-particle model spaces using the spherical version of the proton-neutron quasiparticle random-phase approximation (pnQRPA) with two-nucleon interactions based on the Bonn one-boson-exchange G matrix. The appropriate short-range correlations, nucleon form factors, higher-order nucleonic weak currents, and partial restoration of the isospin symmetry are included in the calculations. The results are compared with earlier calculations of Hyvärinen and Suhonen [Phys. Rev. C 91, 024613 (2015)] performed in much smaller single-particle bases without access to the IVSD Jπ=2− giant-resonance data reported here. ...
PublisherAmerican Physical Society
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