Formation of hypermatter and hypernuclei within transport models in relativistic ion collisions

TL;DR

This paper models hyperon production and hypernuclei formation in relativistic heavy-ion collisions using transport codes, revealing that hypernuclei originate from baryon interactions similar to conventional nuclei, with yield saturation at high energies.

Contribution

It introduces a coalescence model for hyperon capture in transport simulations, explaining hypernuclei formation mechanisms in relativistic collisions.

Findings

Hypernuclei formation is explained by baryon interactions similar to conventional nuclei.

Hyper-fragment yields saturate at high beam energies.

Reactions can produce high hypernuclei yields at moderate energies.

Abstract

Within a combined approach we investigate the main features of the production of hyper-fragments in relativistic heavy-ion collisions. The formation of hyperons is modelled within the UrQMD and HSD transport codes. To describe the hyperon capture by nucleons and nuclear residues a coalescence of baryons (CB) model was developed. We demonstrate that the origin of hypernuclei of various masses can be explained by typical baryon interactions, and that it is similar to processes leading to the production of conventional nuclei. At high beam energies we predict a saturation of the yields of all hyper-fragments, therefore, this kind of reactions can be studied with high yields even at the accelerators of moderate relativistic energies.