135 research outputs found
Time-Dependent Response Calculations of Nuclear Resonances
A new alternate method for evaluating linear response theory is formally
developed, and results are presented. This method involves the time-evolution
of the system using TDHF and is constructed directly on top of a static
Hartree-Fock calculation. By Fourier transforming the time-dependent result the
response function and the total probability amplitude are extracted. This
method allows for a coherent description of static properties of nuclei, such
as binding energies and deformations, while also providing a method for
calculating collective modes and reaction rates. A full 3-D Cartesian
Basis-Spline collocation representation is used with several Skyrme
interactions. Sample results are presented for the giant multipole resonances
of 16O, 40Ca, and 32S and compared to other calculations.Comment: 8 pages, 7 figures, submitted to Phys. Rev.
Coordinate Space HFB Calculations for the Zirconium Isotope Chain up to the Two-Neutron Dripline
We solve the Hartree-Fock-Bogoliubov (HFB) equations for deformed, axially
symmetric even-even nuclei in coordinate space on a 2-D lattice utilizing the
Basis-Spline expansion method. Results are presented for the neutron-rich
zirconium isotopes up to the two-neutron dripline. In particular, we calculate
binding energies, two-neutron separation energies, normal densities and pairing
densities, mean square radii, quadrupole moments, and pairing gaps. Very large
prolate quadrupole deformations (beta2=0.42,0.43,0.47) are found for the
(102,104,112)Zr isotopes, in agreement with recent experimental data. We
compare 2-D Basis-Spline lattice results with the results from a 2-D HFB code
which uses a transformed harmonic oscillator basis.Comment: 9 pages, 9 figure
Ni+Ni fusion reaction calculated with the density-constrained time-dependent Hartree-Fock formalism
We study fusion reactions of the Ni+Ni system using the
density-constrained time-dependent Hartree-Fock (TDHF) formalism. In this
formalism the fusion barriers are directly obtained from TDHF dynamics. In
addition, we incorporate the entrance channel alignments of the slightly
deformed (oblate) Ni nuclei due to dynamical Coulomb excitation. We show
that alignment leads to a fusion barrier distribution and alters the naive
picture for defining which energies are actually sub-barrier. We also show that
core polarization effects could play a significant role in fusion cross section
calculations.Comment: 7 pages, 6 figure
Density-constrained time-dependent Hartree-Fock calculation of O+Pb fusion cross sections
We present a fully microscopic study of the O+Pb fusion using
the density-constrained time-dependent Hartree-Fock theory. The calculated
fusion cross-sections are in good agreement with the experimental data for the
entire energy range indicating that the incorporation of dynamical effects is
crucial in describing heavy-ion fusion.Comment: 5 pages, 3 figure
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