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1. chinaXiv:201708.00268 [pdf]

Analytic continuation of single-particle resonance energy and wave function in relativistic mean field theory

S. S. Zhang; J. Meng; S. G. Zhou; G. C. Hillhouse
Subjects: Physics >> Nuclear Physics

Single-particle resonant states in spherical nuclei are studied by an analytic continuation in the coupling constant (ACCC) method within the framework of the self-consistent relativistic mean field (RMF) theory. Taking the neutron resonant state ν1g9/2 in 60Ca as an example, we examine the analyticity of the eigenvalue and eigenfunction for the Dirac equation with respect to the coupling constant by means of a Pad ?e approximant of the second kind. The RMF-ACCC approach is then applied to 122Zr and, for the first time, this approach is employed to investigate both the energies, widths and wave functions for l ?= 0 resonant states close to the continuum threshold. Predictions are also compared with corresponding results obtained from the scattering phase shift method.

submitted time 2017-08-22 Hits941Downloads523 Comment 0

2. chinaXiv:201708.00265 [pdf]

Multi-chiral doublets in one single nucleus

J. Terasaki; S. Q. Zhang; S. G. Zhou; J. Meng
Subjects: Physics >> Nuclear Physics

Adiabatic and configuration-fixed constraint triaxial relativistic mean field (RMF) approaches are developed for the first time and a new phenomenon, the existence of multi-chiral doublets (MχD), i.e., more than one pairs of chiral doublets bands in one single nucleus, is suggested for 106Rh based on the triaxial deformations together with their corresponding proton and neutron configurations.

submitted time 2017-08-22 Hits698Downloads399 Comment 0

3. chinaXiv:201708.00264 [pdf]

Giant halo in relativistic and non-relativistic approaches

J. Terasaki; S. Q. Zhang; S. G. Zhou; J. Meng
Subjects: Physics >> Nuclear Physics

The phenomena of giant halo and halo of neutron-rich even-Ca isotopes are investigated and compared in the framework of the relativistic continuum Hartree-Bogoliubov (RCHB) and non- relativistic Skyrme Hartree-Fock-Bogoliubov (HFB) calculations. With two parameter sets for each of the RCHB and the Skyrme HFB calculations, it is found that although halo phenomena exist for Ca isotopes near neutron drip line in both calculations, the halo of the Skyrme HFB calculations starts at a more neutron-rich nucleus than that of the RCHB calculations, and the RCHB calculations have larger neutron root-mean-square (rms) radii systematically in N ≥ 40 than those of the Skyrme HFB calculations. The former difference comes from difference in shell structure. The reasons for the latter can be partly explained by the neutron 3s1/2 orbit, which causes more than 50 % of the difference among the four calculations for neutron rms radii at 66Ca.

submitted time 2017-08-22 Hits758Downloads439 Comment 0

4. chinaXiv:201707.00929 [pdf]

Theoretical study of the two-proton halo candidate 17Ne including contributions from resonant continuum and pairing correlations

Shi-ShengZhang; En-GuangZhao; Shan-GuiZhou
Subjects: Physics >> Nuclear Physics

With the relativistic Coulomb wave function boundary condition, the energies, widths and wave functions of the single proton resonant orbitals for 17Ne are studied by the analytical continuation of the coupling constant (ACCC) approach within the framework of the relativistic mean field (RMF) theory. Pairing correlations and contributions from the single-particle resonant orbitals in the continuum are taken into consideration by the resonant Bardeen-Cooper-Schrieffer (BCS) approach, in which constant pairing strength is used. It can be seen that the fully self-consistent calculations with NL3 and NLSH effective interactions mostly agree with the latest experimental measurements, such as binding energies, matter radii, charge radii and densities. The energy of π2s1/2 orbital is slightly higher than that of π1d5/2 orbital, and the occupation probability of the (π2s1/2)2 orbital is about 20%, which are in accordance with the shell model calculation and three-body model estimation.

submitted time 2017-07-30 Hits793Downloads461 Comment 0

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