87 research outputs found
Pairing Effects in Nuclear Fusion Reaction
We simulate a heavy-ion collision using the canonical-basis time-dependent
Hartree-Fock-Bogoliubov theory (Cb-TDHFB) treating pairing correlation in the
three-dimensional coordinate space. We apply the Cb-TDHFB to 22O+22O collision
with a contact-type pairing energy functional, and compare results of Cb-TDHFB
and TDHF to investigate the effects of pairing correlations in nuclear fusion.
Our results seem to indicate that pairing effects do not increase the fusion
cross section in this system.Comment: 4 pges, 2 figures, Proceedings of the 12th Asia Pacific Physics
Conference(APPC12
Systematic study of low-lying E1 strength using the time-dependent mean field theory
We carry out systematic investigation of electric dipole (E1) mode from light
to heavy nuclei, using a new time-dependent mean field theory: the
Canonical-basis Time-Dependent Hartree-Fock-Bogoliubov (Cb-TDHFB) theory. The
Cb-TDHFB in the three-dimensional coordinate space representation can deal with
pairing correlation and any kind of deformation in the time-dependent
framework. We report the neutron-number dependence of the low-energy E1 mode
for light (A 100) around N = 82.Comment: 3 pages, 2 figures, The 11th International Symposium on Origin of
Matter and Evolution of Galaxies (OMEG11) proceeding
Time-dependent density-functional studies on strength functions in neutron-rich nuclei
The electric dipole (E1) strength functions have been systematically
calculated based on the time-dependent density functional theory (TDDFT), using
the finite amplitude method and the real-time approach to the TDDFT with
pairing correlations. The low-energy E1 strengths in neutron-rich isotopes show
peculiar behaviors, such as sudden enhancement and reduction, as functions of
the neutron numbers.They seem to be due to the interplay between the neutron
shell effect and the deformation effect.Comment: 8 pges, 2 figures, Proceedings of the 5th International Conference on
"Fission and properties of neutron-rich nuclei" (ICFN5), Sanibel Island, Nov.
4-10, 201
Linear response calculation using the canonical-basis TDHFB with a schematic pairing functional
A canonical-basis formulation of the time-dependent Hartree-Fock-Bogoliubov
(TDHFB) theory is obtained with an approximation that the pair potential is
assumed to be diagonal in the time-dependent canonical basis. The
canonical-basis formulation significantly reduces the computational cost. We
apply the method to linear-response calculations for even-even nuclei. E1
strength distributions for proton-rich Mg isotopes are systematically
calculated. The calculation suggests strong Landau damping of giant dipole
resonance for drip-line nuclei.Comment: 6 pages, 1 figure, INPC 2010 conference proceding
Self-consistent description of nuclear photoabsorption cross sections
Several approaches to photonuclear reactions, based on the time-dependent
density-functional theory, have been developed recently. The standard
linearization leads to the random-phase approximation (RPA) or the
quasiparticle-random-phase approximation (QRPA). We have developed a
parallelized QRPA computer program for axially deformed nuclei. We also present
a feasible approach to the (Q)RPA calculation, that is the finite amplitude
method (FAM). We show results of photoabsorption cross sections for deformed
nuclei using the QRPA and FAM calculations. Finally, the canonical-basis
approach to the time-dependent Hartree-Fock-Bogoliubov method is presented, to
demonstrate its feasibility and usefulness.Comment: 10 pages, 4 figures, Presented at Zakopane Conference of Nuclear
Physics 201
Study of pygmy dipole resonance with a new time-dependent mean field theory
We carry out a systematic investigation on the low-energy electric dipole
strength, which is often called pygmy dipole resonances (PDR), using the
canonical-basis time-dependent Hartree-Fock-Bogoliubov (Cb-TDHFB) method. The
Cb-TDHFB is a new method which is derived from TDHFB with an approximation
analogous to the BCS theory that the pair potential is assumed to be diagonal
in the time-dependent canonical basis. We apply the method to linear-response
calculation for even-even nuclei. We report the neutron-number dependence of
PDR in light (A 100) around N = 82.Comment: 6 pages, 3 figures, Rutherford Centennial Conference on Nuclear
Physics conference proceeding
Structures of cluster ions of triatomic molecules studied by infrared photodissociation spectroscopy
Gordon Research Conferences –Molecular & Ionic Clusters, September 7-12, 2008, Centre Paul Langevin, in Aussois, Franc
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