Laboratory of Time Analysis of Nuclear Processes

(Head – Dr. Sci., Professor V. S. Olkhovsky)

The laboratory was organized in 1994

Main directions of scientific activity:

·        Theoretical investigations of processes of particles and nuclei tunneling through different types of potential barriers

·        Development of the methods of the particles tunneling in the presence of quantum friction.

·        Theoretical study of decay evolution of radioactive nuclei.

·        Investigation of photon bremsstrahlung during the alpha-decay process.

·        Development of methods of nuclear chronometry with account of the radioactive nuclei in the excited states in natural processes.

·        Study of kinetics and dynamics of lepton-nucleus and hadron-nucleus collisions.

The most important results:

·        General definition of tunneling time, generally recognized, is proposed and proved.     

·        Formulation of Hartman effect for tunneling time of particles, generally recognized, is generalized and improved.

·        Evolution of the particles tunneling through two barriers has been studied.

·        Method of multiple internal reflections for the particles tunneling has been developed.

·        Experiments with neutron tunneling through neutron filters have been explained for the first time.

·        The first experiments of photon bremsstrahlung during the alpha-decay of spherical nuclei have been explained.

·        New algorithm for the calculation of effective time and intensity of the alpha-decay with account of excited states is proposed and calculations of above values have been fulfilled for the decay of a number of radioactive nuclei.

·        The effective time delay of the alpha-decay with account of the formation and decay of the alpha-active nuclei in the excited states in astrophysical and geophysical processes under the influence of cosmic emission on the surface of Earth is shown to be essentially smaller than without such processes.

·        New interpretation of energetic dependence of the radius of the optic potential from the point of view of the time delay of particles scattering in their interaction with the target-nucleus in the low-energy region is proposed for spherical nuclei.

·        Phenomenological model with account of interdependence between rotation and b-, g-vibration modes of a nucleus in description of its energetic and electromagnetic structure has been developed.