4,806 research outputs found
Properties of superdeformed fission isomers in the cranked relativistic Hartree-Bogoliubov theory
The rotational and deformation properties of superdeformed fission isomers in
the mass region have been investigated within the framework of the
cranked relativistic Hartree-Bogoliubov theory. The dependence of the results
of the calculations on the parametrization of the RMF Lagrangian has been
studied. The rotational properties are best described by the NL1 force.Comment: 5 pages, uses epsf.sty and hip-artc.sty, 1 PostScript figure,
contribution to the Proceedings of the International Symposium on Exotic
Nuclear Structures, May 15-20, 2000, Debrecen, Hungar
Superdeformations in Relativistic and Non-Relativistic Mean Field Theories
The applications of the extensions of relativistic mean field (RMF) theory to
the rotating frame, such as cranked relativistic mean field (CRMF) theory and
cranked relativistic Hartree-Bogoliubov (CRHB) theory, for the description of
superdeformed bands in the , 140-150 and 190 mass regions are
overviewed and compared briefly with the results obtained in non-relativistic
mean field theories.Comment: 18 pages including 5 figures in PostScript, requires epsf.sty,
invited talk presented at the International Conference on Achievements and
Perspectives in Nuclear Structure, Crete, Greece, July 11-17, 1999, will be
published in Physica Script
Cranked relativistic Hartree-Bogoliubov theory: Superdeformation in the mass region
A systematic investigation of the yrast superdeformed (SD) rotational bands
in even-even nuclei of the mass region has been performed within
the framework of the cranked relativistic Hartree-Bogoliubov theory. The
particle-hole channel of this theory is treated fully relativistically, while a
finite range two-body force of Gogny type is used in the particle-particle
(pairing) channel. Using the well established parameter sets NL1 for the
Lagrangian and D1S for the Gogny force, very good description of experimental
data is obtained with no adjustable parameters.Comment: 5 pages, 2 Postscript figures, uses sprocl.sty, contribution to the
Proceedings of the International Conference ``Bologna 2000, Structure of the
Nucleus at the Dawn of the Century'
Covariant theory of particle-vibrational coupling and its effect on the single-particle spectrum
The Relativistic Mean Field (RMF) approach describing the motion of
independent particles in effective meson fields is extended by a microscopic
theory of particle vibrational coupling. It leads to an energy dependence of
the relativistic mass operator in the Dyson equation for the single-particle
propagator. This equation is solved in the shell-model of Dirac states. As a
result of the dynamics of particle-vibrational coupling we observe a noticeable
increase of the level density near the Fermi surface. The shifts of the
single-particle levels in the odd nuclei surrounding 208-Pb and the
corresponding distributions of the single-particle strength are discussed and
compared with experimental data.Comment: 27 pages, 8 figure
Configuration mixing of angular-momentum projected triaxial relativistic mean-field wave functions
The framework of relativistic energy density functionals is extended to
include correlations related to the restoration of broken symmetries and to
fluctuations of collective variables. The generator coordinate method is used
to perform configuration mixing of angular-momentum projected wave functions,
generated by constrained self-consistent relativistic mean-field calculations
for triaxial shapes. The effects of triaxial deformation and of -mixing is
illustrated in a study of spectroscopic properties of low-spin states in
Mg.Comment: 15 pages, 11 figures, 4 tables, accepted for publication in Phys.
Rev.
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