1305.5387 (Z. M. Niu et al.)

Nuclear $β^+$/EC decays in covariant density functional theory and
the impact of isoscalar proton-neutron pairing    [PDF]

Z. M. Niu, Y. F. Niu, Q. Liu, H. Z. Liang, J. Y. Guo

Self-consistent proton-neutron quasiparticle random phase approximation based on the spherical nonlinear point-coupling relativistic Hartree-Bogoliubov theory is established and used to investigate the $\beta^+$/EC-decay half-lives of neutron-deficient Ar, Ca, Ti, Fe, Ni, Zn, Cd, and Sn isotopes. The isoscalar proton-neutron pairing is found to play an important role in reducing the decay half-lives, which is consistent with the same mechanism in the $\beta$ decays of neutron-rich nuclei. The experimental $\beta^+$/EC-decay half-lives can be well reproduced by a universal isoscalar proton-neutron pairing strength.

View original: http://arxiv.org/abs/1305.5387