374 research outputs found
Nucleus-nucleus potential, energy dissipation and mass dispersion in fusion and transfer reactions
The nucleus-nucleus potential and energy dissipation in fusion reactions are
obtained from microscopic mean-field dynamics. The deduced potentials nicely
reproduce the one extracted from experimental data. Energy dissipation shows a
universal behaviour between different reactions. Also, the dispersion of mass
distribution in transfer reaction is investigated in a stochastic mean-field
dynamics. By including initial fluctuations in collective space, the
description of the dispersion is much improved compared to that of mean field
only. The result is consistent with the macroscopic phenomenological analysis
of the experimental data.Comment: 4 pages, 4 figures. Proceedings of Second International Workshop on
Compound Nuclear Reactions and Related Topics (CNR*09), October 5-8, 2009,
Bordeaux, Franc
Multipole Modes for Triaxially Deformed Superfluid Nuclei
To study shape fluctuations of nuclei in transitional regions, the collective
Hamiltonian method has often been employed. We intend to construct the
quadrupole collective Hamiltonian with the collective inertial functions given
by the local quasiparticle random-phase approximation (QRPA) based on the
Skyrme energy density functional. For this purpose, we first construct a
practical framework of Skyrme QRPA for triaxial nuclear shapes with the finite
amplitude method (FAM). We show quadrupole strength functions for a triaxial
superfluid nucleus Os and the Thouless-Valatin rotational moment of
inertia by the local FAM-QRPA for Pd.Comment: 4 pages, 2 figures, accepted for publication in Proceedings of Ito
International Research Center (IIRC) Symposium "Perspectives of the Physics
of Nuclear Structure" (JPS Proc. Conf.
Probing surface diffuseness of nucleus-nucleus potential with quasielastic scattering at deep sub-barrier energies
We perform a systematic study on the surface property of nucleus-nucleus
potential in heavy-ion reactions using large-angle quasielastic scattering at
energies well below the Coulomb barrier. At these energies, the quasielastic
scattering can be well described by a single-channel potential model.
Exploiting this fact, we point out that systems which involve spherical nuclei
require the diffuseness parameter of around 0.60 fm in order to fit the
experimental data, while systems with a deformed target between 0.8 fm and 1.1
fm.Comment: 6 pages, 6 figure
One-body energy dissipation in fusion reaction from mean-field theory
Information on dissipation in the entrance channel of heavy-ion collisions is
extracted by macroscopic reduction procedure of Time-Dependent Hartree-Fock
theory. The method gives access to a fully microscopic description of the
friction coefficient associated with transfer of energy from the relative
motion towards intrinsic degrees of freedom. The reduced friction coefficient
exhibits a universal behavior, i.e. almost independent of systems investigated,
whose order of magnitude is comparable with the calculations based on linear
response theory. Similarly to nucleus-nucleus potential, especially close to
the Coulomb barrier, there are sizable dynamical effects on the magnitude and
form factor of friction coefficient.Comment: 7 pages, 10 figure
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