Bogoliubov Laboratory of Theoretical Physics

Seminar on Nuclear Theory

Date and Time: Monday, 8 August 2022, at 3:30 PM

Venue: Blokhintsev lecture hall, Bogoliubov Laboratory of Theoretical Physics

Seminar topic: “Production of nuclei and hypernuclei in intermediate- and high-energy nuclear reactions”

Speaker: A. S. Botvina

Abstract:

The main mechanisms leading to the production of light and intermediate mass nuclei and hypernuclei are under study. In these many-body phenomena one can separate and investigate the nucleation processes characterising the excited nuclear matter. The deep-inelastic high-energy collisions do lead to the fragmentation and multifragmentation of nuclear matter and, in addition, the hyper-fragments can be abundantly produced. To describe reactions with finite nuclei the dynamical and statistical models are used. The promising process for such a production is the disintegration of large excited nuclear and hyper-nuclear residues produced in peripheral nucleus-nucleus collisions. In central collisions, we prove a novel mechanism responsible for combining nucleons and hyperons into complex nuclei: The intermediate excited clusters of baryons can be formed at a low sub-nuclear density when the nuclear matter expands. One can describe the nucleation process within the statistical approach as the disintegration of such clusters. This approach is able to describe the experimental data measured in central collisions, that was not possible with other methods. The important consequence of this novel mechanism is the correlations of the produced nuclear species.