Seminar “Nuclear Theory”

Date and Time: Monday, 25 January 2021, at 3:30 PM

Venue: Online conference on Zoom, Bogoliubov Laboratory of Theoretical Physics

Seminar topic: «Three-atomic systems at ultralow energies in the Faddeev approach»

Speaker: E. A. Kolganova

Abstract:

Weakly bound van der Waals triatomic clusters are the systems where a manifestation of the Efimov effect is rather possible. This applies primarily to the naturally existing helium trimer ⁴He₃ whose excited state has been proven to be of the Efimov nature. We present the results of a series of our works devoted to the theoretical study of the helium trimer ⁴He₃ and several other three-atom systems of the form ⁴He₂X with X=³He, ⁶Li, ⁷Li. Our results were obtained on the basis of the numerical solution of Faddeev differential equations with realistic interatomic interactions and in many aspects are pioneering. For example, we were the first to calculate the phases and/or scattering lengths in collisions of atoms of helium and lithium isotopes with the ⁴He₂ dimer. Our calculations of the binding energies of these triatomic systems are also among the first ones. In addition, we were the first to establish the internal mechanism of the emergence of new Efimov states of the ⁴He₃ trimer from virtual states.
(based on Dr.Sci. Thesis)