35 research outputs found
Rotational damping in a multi- shell particles-rotor model
The damping of collective rotational motion is investigated by means of
particles-rotor model in which the angular momentum coupling is treated exactly
and the valence nucleons are in a multi- shell mean-field. It is found that
the onset energy of rotational damping is around 1.1 MeV above yrast line, and
the number of states which form rotational band structure is thus limited. The
number of calculated rotational bands around 30 at a given angular momentum
agrees qualitatively with experimental data. The onset of rotational damping
takes place gradually as a function of excitation energy. It is shown that the
pairing correlation between valence nucleons has a significant effect on the
appearance of rotational damping.Comment: 20 pages, 9 figure
Re-visit the N/Z ratio of free nucleons from collisions of neutron-rich nuclei as a probe of EoS of asymmetric nuclear matter
The N/Z ratio of free nucleons from collisions of neutron-rich nuclei as a function of their momentum is studied by means of Isospin dependent Quantum Molecular Dynamics. We find that this ratio is not only sensitive to the form of the density dependence of the symmetry potential energy but also its strength determined by the symmetry energy coe cient. The uncertainties about the symmetry energy coe cient influence the accuracy of probing the density dependence of the symmetry energy by means of the N/Z ratio of free nucleons of neutron-rich nuclei
Re-visit the N/Z ratio of free nucleons from collisions of neutron -rich nuclei as a probe of EoS of asymmetric nuclear matter
The N/Z ratio of free nucleons from collisions of neutron-rich nuclei as a
function of their momentum is studied by means of Isospin dependent Quantum
Molecular Dynamics.
We find that this ratio is not only sensitive to the form of the density
dependence of the symmetry potential energy but also its strength determined by
the symmetry energy coefficient.
The uncertainties about the symmetry energy coefficient influence the
accuracy of probing the density dependence of the symmetry energy by means of
the N/Z ratio of free nucleons of neutron-rich nuclei.Comment: 15 pages, 6 figures, 2 tables. accepted by Commun. Theor. Phys.
(Beijing, China
Deformation and orientation effects in the driving potential of the dinuclear model
A double-folding method is used to calculate the nuclear and Coulomb
interaction between two deformed nuclei with arbitrary orientations. A
simplified Skryme-type interaction is adopted. The contributions of nuclear
interaction and Coulomb interaction due to the deformation and orientation of
the nuclei are evaluated for the driving potential used in the description of
heavy-ion fusion reaction. So far there is no satisfactory theory to describe
the evolution of the dynamical nuclear deformation and orientations during the
heavy-ion fusion process. Our results estimated the magnitude of above effects.Comment: 15 pages, 6 figures, Accepted by Eur. Phys. Jour.
Particle transfer and fusion cross-section for Super-heavy nuclei in dinuclear system
Within the dinuclear system (DNS) conception, instead of solving
Fokker-Planck Equation (FPE) analytically, the Master equation is solved
numerically to calculate the fusion probability of super-heavy nuclei, so that
the harmonic oscillator approximation to the potential energy of the DNS is
avoided. The relative motion concerning the energy, the angular momentum, and
the fragment deformation relaxations is explicitly treated to couple with the
diffusion process, so that the nucleon transition probabilities, which are
derived microscopically, are time-dependent. Comparing with the analytical
solution of FPE, our results preserve more dynamical effects. The calculated
evaporation residue cross sections for one-neutron emission channel of Pb-based
reactions are basically in agreement with the known experimental data within
one order of magnitude.Comment: 19 pages, plus 6 figures, submitted to Phys. Rev.
Applications of Skyrme energy-density functional to fusion reactions spanning the fusion barriers
The Skyrme energy density functional has been applied to the study of
heavy-ion fusion reactions. The barriers for fusion reactions are calculated by
the Skyrme energy density functional with proton and neutron density
distributions determined by using restricted density variational (RDV) method
within the same energy density functional together with semi-classical approach
known as the extended semi-classical Thomas-Fermi method. Based on the fusion
barrier obtained, we propose a parametrization of the empirical barrier
distribution to take into account the multi-dimensional character of real
barrier and then apply it to calculate the fusion excitation functions in terms
of barrier penetration concept. A large number of measured fusion excitation
functions spanning the fusion barriers can be reproduced well. The competition
between suppression and enhancement effects on sub-barrier fusion caused by
neutron-shell-closure and excess neutron effects is studied.Comment: 28 pages, 13 figures and 2 tables. accepted by Nucl. Phys.
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Music Score for Sticky
The thesis is a film composition scoring for the animated documentary film Sticky directed and produced by Jilli Rose, 2013. The film is 20 minutes long and talking about an expedition to the Ball's Pyramid Island, Australia, and the discovery of the stick insect-a type of phasmid which has disappeared on the Lord Howe Island, Australia since 1920, and how to rescue it and preserve it. The music is mainly composed based on orchestra and combining some electronic synthesis instruments with effects produced by DAW. The total duration of all cues is about 15 minutes. The final version of the thesis will consist of two parts: 1) audio files, which is produced by the combination of recorded music and virtual instruments; 2) the full score of all the cues