574 research outputs found
Excitation energy of superdeformed bands in Relativistic Mean Field Theory
Constrained Relativistic Mean Field (RMF) calculations have been carried out
to estimate excitation energies relative to the ground state for superdeformed
bands in the mass regions A 190 and A 150. It is shown that RMF
theory is able to successfully reproduce the recently measured superdeformed
minima in Hg and Pb nuclei.Comment: 7 pages, LaTex, 3 p.s figures, Phys. Lett B. (to appear
Ground-state properties of deformed proton emitters in the relativistic Hartree-Bogoliubov model
The Relativistic Hartree Bogoliubov (RHB) model is applied in the description
of ground-state properties of proton-rich odd-Z nuclei in the region . The NL3 effective interaction is used in the mean-field Lagrangian,
and pairing correlations are described by the pairing part of the finite range
Gogny interaction D1S. The model predicts the location of the proton drip-line,
the ground-state quadrupole deformations and one-proton separation energies at
and beyond the drip-line, the deformed single-particle orbitals occupied by the
odd valence proton, and the corresponding spectroscopic factors. The results of
fully self-consistent RHB calculations are compared with available experimental
data, and with predictions of the macroscopic-microscopic mass model.Comment: 39 pages, Latex, 6 e.p.s figures, Nucl. Phys. A in prin
Relativistic Hartree-Bogoliubov description of sizes and shapes of A=20 isobars
Ground-state properties of A = 20 nuclei (N, O, F,
Ne, Na, Mg) are described in the framework of Relativistic
Hartree-Bogoliubov (RHB) theory. The model uses the NL3 effective interaction
in the mean-field Lagrangian, and describes pairing correlations by the pairing
part of the finite range Gogny interaction D1S. Binding energies, quadrupole
deformations, nuclear matter radii, and differences in radii of proton and
neutron distributions are compared with recent experimental data.Comment: LaTeX 11 pages, 6 eps figs, submitted to Nucl. Phys.
Isospin Dependence of Proton and Neutron Radii within Relativistic Mean Field Theory
The binding energies, shapes and sizes of even-even beta-stable nuclei with A
>= 40 and a few chains of isotopes with Z=50, 56, 82, 94 protons and isotones
with N=50, 82, 126 neutrons are analyzed. The average isospin dependence of the
radii of protons and neutrons evaluated within the relativistic mean field
theory is studied. A simple, phenomenological formula for neutron radii is
proposed.Comment: 10 pages in Latex and 14 figures in the eps forma
Mapping the proton drip line from Z=31 to Z=49
The structure of proton drip line nuclei in the 60 < A < 100 mass range is
studied with the Relativistic Hartree Bogoliubov (RHB) model. For the elements
which determine the astrophysical rapid proton capture process path, the RHB
model predicts the location of the proton drip-line, the ground-state
quadrupole deformations and one-proton separation energies at and beyond the
drip-line. The results of the present theoretical investigation are compared
with available experimental data. For possible odd-Z ground state proton
emitters, the calculated deformed single-particle orbitals occupied by the odd
valence proton and the corresponding spectroscopic factors are compared with
predictions of the macroscopic-microscopic mass model.Comment: 20 pages, LaTeX, 6 eps figs, submitted to Nucl. Phys.
Shape Coexistence in the Relativistic Hartree-Bogoliubov approach
The phenomenon of shape coexistence is studied in the Relativistic
Hartree-Bogoliubov framework. Standard relativistic mean-field effective
interactions do not reproduce the ground state properties of neutron-deficient
Pt-Hg-Pb isotopes. It is shown that, in order to consistently describe binding
energies, radii and ground state deformations of these nuclei, effective
interactions have to be constructed which take into account the sizes of
spherical shell gaps.Comment: 19 pages, 8 figures, accepted in Phys. Rev.
Relativistic mean-field description of the dynamics of giant resonances
The relativistic mean-field theory provides a framework in which the nuclear
many-body problem is described as a self-consistent system of nucleons and
mesons. In the mean-field approximation, the self-consistent time evolution of
the nuclear system describes the dynamics of collective motion: nuclear
compressibility from monopole resonances, regular and chaotic dynamics of
isoscalar and isovector collective vibrations.Comment: LaTeX, 10 pages, 5 figures, Invited Talk, Topical Conference on Giant
resonances, Varenna, May 1998, to be published in Nucl. Phys.
Relativistic Hartree-Bogoliubov description of the deformed ground-state proton emitters
Ground-state properties of deformed proton-rich odd-Z nuclei in the region
are described in the framework of Relativistic Hartree
Bogoliubov (RHB) theory. One-proton separation energies and ground-state
quadrupole deformations that result from fully self-consistent microscopic
calculations are compared with available experimental data. The model predicts
the location of the proton drip-line, the properties of proton emitters beyond
the drip-line, and provides information about the deformed single-particle
orbitals occupied by the odd valence proton.Comment: 9 pages, RevTeX, 3 PS figures, submitted Phys. Rev. Letter
Computer program for the relativistic mean field description of the ground state properties of even-even axially deformed nuclei
A Fortran program for the calculation of the ground state properties of
axially deformed even-even nuclei in the relativistic framework is presented.
In this relativistic mean field (RMF) approach a set of coupled differential
equations namely the Dirac equation with potential terms for the nucleons and
the Glein-Gordon type equations with sources for the meson and the
electromagnetic fields are to be solved self-consistently. The well tested
basis expansion method is used for this purpose. Accordingly a set of harmonic
oscillator basis generated by an axially deformed potential are used in the
expansion. The solution gives the nucleon spinors, the fields and level
occupancies, which are used in the calculation of the ground state properties.Comment: 18 pages, LaTex, 6 p.s figures, To appear in Comput. Phys. Commu
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