Theory of Nuclear Systems

Participating Countries and International organizations:

Armenia, Austria, Belarus, Belgium, Brazil, Bulgaria, Canada, China, Czech Republic, Egypt, France, Germany, Greece, Hungary, India, Iran, Italy, Japan, Kazakhstan, Lithuania, Moldova, Norway, Poland, Republic of Korea, Romania, Russia, Serbia, Slovakia, South Africa, Spain, Sweden, Switzerland, Taiwan, Ukraine, United Kingdom, USA, Uzbekistan.

Issues addressed and main goals of research:

Suggestion of new theoretical approaches for description and prediction of properties of superheavy, unstable nuclei and exotic nuclear systems, calculation of their characteristics; improvement of models for explanation of mechanisms of reactions of nuclei with particles and nuclei at low and intermediate energies; establishment of universal laws in low-dimensional small-particle systems and small-particle systems at ultra-low energies; development of the two-stage hybrid model of nuclear collisions at relativistic energies; study of nonlinear quantum processes in the interaction of photons with ultrashort high-frequency laser pulses.

Expected main results in the current year:

• Investigation of the coupling between electric and magnetic vortical states in deformed nuclei within the Skyrme random-phase-approximation method.

Study of the effects of the phonon-phonon coupling on the properties of low-lying quadrupole states in the N=80 isotopes.

Study of the nature of three branches of the nuclear scissors mode and associated neutron and proton currents taking into account spin degrees of freedom within the framework of the Wigner function moments method.

Microscopic analysis of the nature of the spin scissors mode in deformed nuclei.

Analysis of the γγ-decay width of a low-energy quadrupole state.

Study of electromagnetic transitions in superheavy atomic nuclei.

• Calculation and analysis of the production cross sections for superheavy nuclei with Z = 112-126 using various predictions of their properties.

Study of the energy dependence of the total kinetic energy of fission fragments in the pre-actinide and actinide regions.

Derivation of the analytical formula for the fusion reaction cross section at sub-barrier energies.

Study of open quantum systems in external time-dependent fields.

Calculation of spontaneous fission half-lives within the cluster approach.

Investigation of the shape co-existence phenomenon and phase transitions in atomic nuclei.  

Investigation of isovector pair correlations in nuclei with A~56.

Analysis of the contribution of various n-particle- n-hole configurations in the formation of spreading widths of giant nuclear resonances.

Calculation of partial cross sections of angular and mass distributions for products formed in deep inelastic reactions and quasifission.

• Bound state calculation of a two-atom system in a two-dimensional anharmonic trap.

Investigation of cluster correlations of 1p-shell nuclei in direct nuclear reactions.

Computation of resonances in Efimov-type systems.

Study of the structure of weakly bound triatomic systems.

Study of the effect of inelastic nuclear scattering on supernova neutrino spectra.

Investigation of the time evolution of the system of two interacting dipoles in external fields in two-dimensional geometry of an optical trap.

Development of the model of interaction between neutral particles and non-spherical nuclei.

Calculations of the 0₃⁺ state of the ¹²C nucleus in the α cluster model.

Development of a nonperturbative approach for quantitative analysis of the Coulomb and nuclear breakup of halo nuclei in the region of intermediate and low energies.

Optimal bounds on the speed of the subspace time evolution generated by quantum-mechanical Hamiltonians.

Calculation of the population of atomic levels under the action of a laser pulse of finite length in the adiabatic limit.

Low-energy asymptotics of the two-dimensional scattering phase shifts by а central power-like potential.

Modelling of the high harmonic generation by elliptically polarized strong laser fields beyond the dipole approximation.

Calculation of bound states in the continuum generated by super-interference.

Study of the near-surface diffusion in tunneling of diatomic beryllium molecules through the potential barriers in the strong channel coupling method.

• Identification of physical observables that are sensitive to the dynamics of multi-photon processes caused by intense short and ultra-short laser pulses with arbitrary polarization.

Modification of theoretical models for the processes of photo- and hadro- production in order to study the reaction mechanism and structure of exotic hadrons.

Calculation of the cross sections for reactions of the Y-meson with light mesons in the framework of the chiral model using different form-factors.

Investigation of the phase diagram structure for the quark matter under rotation in the framework of the Nambu-Jona-Losinio model.

Development of the existing and new approaches to solve the Dyson-Schwinger equations for quark and gluon propagators and the Bethe-Salpeter equations for quarkonia and glueballs at zero and finite temperature, and investigation of the analytical properties of the obtained solutions in the complex Euclidean plane.

Detailed study of the temperature dependence of gluon and quark propagators in the neighbourhood of temperatures of possible phase (crossover) transitions within the framework of Matsubara imaginary time formalism.

Theoretical analysis of the peculiarities of the pion-nucleon 3-3 resonance in pion-meson scattering on bound nucleons in nuclei.

Investigation of the transverse momentum distributions of hadrons created in heavy-ion and proton-proton collisions in the framework of statistical models.

Calculation of relativistic corrections to the form factors of three-nucleon bound states caused by Lorentz transformations using multi-rank separable potentials.

Investigation of the impact of the quark anomalous magnetic moment on the pion electromagnetic form factor.

Collaboration