114 research outputs found
Properties of N=90 Isotones within the Mean Field Perspective
In recent years, the N=90 isotones have been investigated to a large extent
in relation to studies of quantum phase transitions. In this paper, we use the
mean field approach with pairing-deformation self consistent Total Routhian
Surface (TRS) calculations to study the N=90 isotones and neigh- bouring
nuclei. The important probes, such as moments of inertia, quadrupole moments,
the energy ratio of E(4+1)/E(2+1), octupole and hexadecapole degrees of freedom
are considered and the cal- culated results are compared with the available
experimental data. From a microscopic point of view, the N=90 isotones
characterize the onset of the deformed region and are very well described by
mean field calculations. The results are compared with those from other studies
in beyond mean-field approximations. Shape coexistence phenomena in the region
of interest are discussed.Comment: 7 pages, 10 figure
Exotic nuclear phases in the inner crust of neutron stars in the light of Skyrme-Hartree-Fock theory
The bottom part of the neutron star crust is investigated using the
Skyrme-Hartree-Fock approach with the Coulomb interaction treated beyond the
Wigner-Seitz approximation. A variety of nuclear phases is found to coexist in
this region. Their stability and relative energies are governed by the Coulomb,
surface and shell energies. We have also found that a substantial contribution
is coming from the spin-orbit interaction.Comment: 4 pages, 1 eps figure, Talk at the 17th Nuclear Physics Divisional
Conference of the EPS: Nuclear Physics in Astrophysics, Debrecen, Hungary,
Sept. 30 - Oct. 4, 200
Quantum fluctuations and stability of tetrahedral deformations in atomic nuclei
The possible existence of stable axial octupole and tetrahedral deformations
is investigated in Zr and Zr. HFBCS calculations with parity
projection have been performed for various parametrizations of the Skyrme
energy functional. The correlation and excitation energies of negative parity
states associated with shape fluctuations have been obtained using the
generator coordinate method (GCM). The results indicate that in these nuclei
both the axial octupole and tetrahedral deformations are of dynamic character
and possess similar characteristics. Various Skyrme forces give consistent
results as a function of these two octupole degrees of freedom both at the
mean-field level as well as for configuration mixing calculations.Comment: 8 pages, 4 figures, submitted to IJMP
GCM study of hexadecapole correlations in superdeformed Hg
The role of hexadecapole correlations in the lowest superdeformed band of
Hg is studied by self consistent mean field methods. The generator
coordinate method with particle number projection has been applied using
Hartree-Fock wave functions defined along three different hexadecapole paths.
In all cases, the ground state is not significantly affected by hexadecapole
correlations and the energies of the corresponding first excited hexadecapole
vibrational states lie high in energy. The effect of rotation is investigated
with the Skyrme-Hartree-Fock-Bogolyubov method and a zero range
density-dependent pairing interaction.Comment: REVTeX file, 10 pages, 3 figures (available as postscript files upon
request to [email protected]), submitted to Phys. Rev.
Neutron stars and the fermionic Casimir effect
The inner crust of neutron stars consists of nuclei of various shapes
immersed in a neutron gas and stabilized by the Coulomb interaction in the form
of a crystal lattice. The scattering of neutrons on nuclear inhomegeneities
leads to the quantum correction to the total energy of the system. This
correction resembles the Casimir energy and turns out to have a large influence
on the structure of the crust.Comment: 6 pages, 1 figure, presented at the Fifth Workshop on Quantum Field
Theory under the Influence of External Conditions, Leipzig, Germany,
September 10-15, 2001, to appear in Int. J. Mod. Phys.
Unexpected goings-on in the structure of a neutron star crust
We present a brief account of two phenomena taking place in a neutron star
crust: the Fermionic Casimir effect and the major density depletion of the
cores of the superfluid neutron vortices.Comment: 6 pages, invited talk presented by AB at Tours 2003 Symposium on
Nuclear Physics, August 26-29,Tours, Franc
Induced fission of 240Pu
We study the fission dynamics of 240Pu within an implementation of the
Density Functional Theory (DFT) extended to superfluid systems and real-time
dynamics. We demonstrate the critical role played by the pairing correlations.
The evolution is found to be much slower than previously expected in this fully
non-adiabatic treatment of nuclear dynamics, where there are no symmetry
restrictions and all collective degrees of freedom (CDOF) are allowed to
participate in the dynamics.Comment: 8 pages, 4 figures, talk given at The 6th International Conference on
Fission and Properties of Neutron-Rich Nuclei, Sanibel Island, Florida,
November 6-2 (2016
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