Browsing by Author "Liang, H. Z."

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    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.
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    Towards the improvement of spin-isospin properties in nuclear energy density functionals
    (IOP Publishing, 2016) Roca-Maza, X.; Colo, G.; Liang, H. Z.; Meng, Jie; Ring, P.; Sagawa, H.; Zhao, P. W.
    We address the problem of improving existing nuclear Energy Density Functionals (EDFs) in the spin-isospin channel. For that, we propose two different ways. The first one is to carefully take into account in the fitting protocol some of the key ground state properties for an accurate description of the most studied spin-isospin resonances: the Gamow-Teller Resonance (GTR) [1]. The second consists in providing a strategy to build local covariant EDF keeping the main features from their non-local counterparts [2]. The RHF model based on a Lagrangian where heavy mesons carry the nuclear effective interaction have been shown to be successful in the description of spin-isospin resonances [3].