IMPRESS-U Call Partner Search Tool

General Information

• Type: Partner looking for project
• Organisation: NSC Kharkov Institute of Physics & Technology
• Country: Ukraine (UA)

Research area

• NSF calls:
  • EAGER
  • International Supplements
• Keywords:

  particle passage through matter; x-ray and gamma-radiation sources; atomic physics; quantum mechanics and electrodynamics

• Brief description of your expertise / expertise you are looking for:

  Primary: High-energy electrodynamics in matter (multiple Coulomb scattering in amorphous matter, channeling in crystals, high-energy beam deflection by bent crystals, gamma radiation sources); Compton scattering. More recent: Statistical description of atoms; Atomic shell structure and analysis; Semiclassical physics in atoms.

• Brief description of your project / the project you would like to join:

  In 2024 I planned to deal with the following problems: (i) For high-energy axial channeling of negatively charged particles, seek regimes when the particle in a crystal is above the potential barrier, but nonetheless moves in a finite domain in the transverse direction. Then it behaves similarly to channeled particles, and if the crystal is bent, must follow the bend. That was initially believed to be impossible due to the chaos in an effectively 2-dimensional intra-crystal continuous potential, but appears to be possible if the chaos is weak (there exists an additional although approximate integral of motion). Similar problems also arise in the physics of planetary systems and galactic discs. (ii) 3- and 4-spin correlations in Compton scattering. This requires development of a suitable bispinor calculation technique related with the kinematics. The developed technique can also be useful for calculation of other tree-level fermion-boson scattering processes. (iii) Study of the effect of the (modified) Thomas-Fermi atomic potential on inner, intermediate and outer atomic shells. The applications include Z-dependencies of quantum defects (Moseley’s rule, etc.) and the order of shell filling in atoms (Madelung’s rule, Janet’s Periodic table, etc.). The developed techniques for description of tunneling at near-barrier energies also apply to other areas of quantum physics (solid-state, molecular, electron microscopy, etc.).

Miccola V. Bondarenco

• Organisation: NSC Kharkov Institute of Physics & Technology
• Position: principal researcher
• E-mail: bon@kipt.kharkov.ua