Browsing by Author "Long, W. H."

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Self-consistent relativistic quasiparticle random-phase approximation and its applications to charge-exchange excitations
    (American Physical Society, 2017) Niu, Z. M.; Niu, Y. F.; Liang, H. Z.; Long, W. H.; Meng, Jie
    The self-consistent quasiparticle random-phase approximation (QRPA) approach is formulated in the canonical single-nucleon basis of the relativistic Hatree–Fock–Bogoliubov (RHFB) theory. This approach is applied to study the isobaric analog states (IASs) and Gamow–Teller resonances (GTRs) by taking Sn isotopes as examples. It is found that self-consistent treatment of the particle-particle residual interaction is essential to concentrate the IAS in a single peak for open-shell nuclei and the Coulomb exchange term is very important to predict the IAS energies. For the GTR, the isovector pairing can increase the calculated GTR energy, while the isoscalar pairing has an important influence on the low-lying tail of the Gamow–Teller transition.
  • Thumbnail Image
    Item
    β-decayhalf-lives of neutron-rich nuclei and matter flow in the r-process
    (Elsevier, 2013) Niu, Z. M.; Niu, Y. F.; Liang, H. Z.; Long, W. H.; Niksic, T.; Vretenar, D.; Meng, J.
    The β-decay half-lives of neutron-rich nuclei with are systematically investigated using the newly developed fully self-consistent proton–neutron quasiparticle random phase approximation (QRPA), based on the spherical relativistic Hartree–Fock–Bogoliubov (RHFB) framework. Available data are reproduced by including an isospin-dependent proton–neutron pairing interaction in the isoscalar channel of the RHFB + QRPA model. With the calculated β-decay half-lives of neutron-rich nuclei a remarkable speeding up of r-matter flow is predicted. This leads to enhanced r-process abundances of elements with , an important result for the understanding of the origin of heavy elements in the universe.