Bochum 2009 – wissenschaftliches Programm
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HK: Fachverband Hadronen und Kerne
HK 67: Poster Session
HK 67.61: Poster
Donnerstag, 19. März 2009, 14:00–16:00, Audi-Max
Self-Consistent Covariant Descriptions of Spin-Isospin Resonances — •Haozhao Liang1,2, Nguyen Van Giai1, and Jie Meng2 — 1Institut de Physique Nucléaire, 91406 Orsay, France — 2School of Physics, Peking University, Beijing 100871, P.R. China
Spin-isospin excitations in nuclei become one of the central topics in nuclear physics and astrophysics. Basically, a systematic pattern of the energy and collectivity of these resonances could provide direct information on the spin and isospin properties of the in-medium nuclear interaction. Furthermore, the neutron skin thickness can be determined indirectly by the sum rule of spin-dipole resonances (SDR) or the excitation energy difference between isobaric analog states (IAS) and Gamow-Teller resonances (GTR). More generally, spin-isospin resonances allow one to attack other kinds of problems outside the realm of nuclear structure, like the β-decay of nuclei which lie on the r-process path of stellar nucleosynthesis, and so on.
In this work, a fully self-consistent charge-exchange relativistic random phase approximation (RPA) based on the relativistic Hartree-Fock (RHF) approach is established. The self-consistency is verified by the so-called IAS check. The excitation properties and the non-energy weighted sum rules of the GTR and SDR are well reproduced in the doubly magic nuclei 48Ca, 90Zr and 208Pb without any readjustment of the particle-hole residual interaction. Furthermore, the importance of exchange diagram contributions is demonstrated.
Reference: H. Liang, N. Van Giai, J. Meng, Phys. Rev. Lett. 101, 122502 (2008).