V. M. Kolomietz

Memory effects on descent from the nuclear fission barrier

Non-Markovian transport equations for nuclear large amplitude motion are derived from the collisional kinetic equation. The memory effects are caused by Fermi surface distortions and depend on the relaxation time. It is shown that nuclear collective motion and nuclear fission are influenced strongly by memory effects at the relaxation time

Nucleon distribution in nuclei beyond \beta-stability line

\ensuremath{\tau}g~5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}23} \mathrm{s}.

Isoscalar giant monopole resonance and its overtone in microscopic and macroscopic models

In particular, the descent of the nucleus from the fission barrier is accompanied by characteristic shape oscillations. The eigenfrequency and the damping of the shape oscillations depend on the contribution of the memory integral in the equations of motion. The shape oscillations disappear at the short relaxation time regime at

Nuclear level density with fixed exciton number

\stackrel{\ensuremath{\rightarrow}}{\mathrm{\ensuremath{\tau}}}

Sound modes in hot nuclear matter

0, which corresponds to the usual Markovian motion in the presence of friction forces. We show that the elastic forces produced by the memory integral lead to a significant delay for the descent of the nucleus from the barrier. Numerical calculations for the nucleus

Retardation effects in damping of nuclear collective excitations

{}^{236}\mathrm{U}

Curved and diffuse interface effects on the nuclear surface tension

show that due to the memory effect the saddle-to-scission time grows by a factor of about 3 with respect to the corresponding saddle-to-scission time obtained in liquid drop model calculations with friction forces.

Collisional relaxation of collective motion in a finite Fermi liquid

The radii of nucleon distribution, bulk density, and neutron skin in nuclei beyond the \beta-stability line are studied within the direct variational method. We evaluate the partial equation of state of finite nuclei and demonstrate that the bulk density decreases beyond the beta stability line. We show that the growth of the neutron skin in unstable nuclei does not obey the saturation condition because of the polarization effect. The value of the neutron-skin thickness \Delta r_{np}=\sqrt{ }-\sqrt{ } is caused by the different radii (skin effect) and only slightly by the different shapes (halo effect) of neutron and proton distributions. The relative contribution of both effects depends on the competition between the symmetry energy, and the spin-orbit and Coulomb interactions. The calculations of the isovector shift of the nuclear radius \Delta r_{np} show its primarily linear dependence on the asymmetry parameter X=(N-Z)/A.

Shape fluctuations in a Fermi system with nonlinear dissipativity

We calculate the transition density for the overtone of the isosclar giant monopole resonance (ISGMR) from the response to an appropriate external field

Relaxation time of nonequilibrium nuclear system

\hat{f}_\xi(r)