5,062 research outputs found
The isovector dipole strength in nuclei with extreme neutron excess
The E1 strength is systematically analyzed in very neutron-rich Sn nuclei,
beyond Sn until Sn, within the Relativistic Quasiparticle
Random Phase Approximation. The great neutron excess favors the appearance of a
deformed ground state for Sn. The evolution of the low-lying
strength in deformed nuclei is determined by the interplay of two factors,
isospin asymmetry and deformation: while greater neutron excess increases the
total low-lying strength, deformation hinders and spreads it. Very neutron rich
deformed nuclei may not be as good candidates as stable spherical nuclei like
Sn for the experimental study of low-lying E1 strength
Spectroscopy of the heaviest nuclei (theory)
Recent progress in the applications of covariant density functional theory
(CDFT) to the description of the spectroscopy of the heaviest nuclei is
reviewed. The analysis of quasiparticle spectra in actinides and the heaviest A
~ 250 nuclei provides a measure of the accuracy of the description of
single-particle energies in CDFT and an additional constraint for the choice of
effective interactions for the description of superheavy nuclei. The response
of these nuclei to the rotation is rather well described by cranked
relativistic Hartree+Bogoliubov theory and it serves as a supplementary tool in
configuration assignment in odd-mass nuclei. A systematic analysis of the
fission barriers with allowance for triaxial deformation shows that covariant
density functional theory is able to describe fission barriers on a level of
accuracy comparable with the best phenomenological macroscopic+microscopic
approaches.Comment: 10 pages, 7 figures, invited talk of A.V. Afanasjev at the
International Nuclear Physics Conference (INPC 2010), Vancouver, Canada, July
4-9, 2010, to be published in Journal of Physics G: Conference Series (JPCS
Nuclear energy density functionals: what we can learn about/from their global performance?
A short review of recent results on the global performance of covariant
energy density functionals is presented. It is focused on the analysis of the
accuracy of the description of physical observables of ground and excited
states as well as to related theoretical uncertainties. In addition, a global
analysis of pairing properties is presented and the impact of pairing on the
position of two-neutron drip line is discussed.Comment: 11 pages, 9 figures, Proceedings of the conference on Nuclei and
Mesoscopic Physics 2014, MS
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