Dynamics of light hypernuclei in collisions of $^{197}$Au+$^{197}$Au at GeV energies

TL;DR

This study investigates the production and flow of light hypernuclei in gold-gold collisions at GeV energies using a microscopic transport model, revealing insights into hyperon dynamics and hypernuclear formation.

Contribution

It introduces a comprehensive transport model that includes hyperon production channels and analyzes hypernuclear flows and yields across multiple energies.

Findings

Hyperon-nucleon potential has negligible effect on free hyperons.

Hypernuclear yields increase with beam energy.

Flow patterns of hypernuclei are consistent with nuclear clusters.

Abstract

The dynamics of light hypernuclei and nuclear clusters produced in $^{197}$Au+$^{197}$Au collisions has been investigated thoroughly with a microscopic transport model. All possible channels of hyperon production and transportation of hyperons in nuclear medium are implemented into the model. The light complex fragments are recognized with the Wigner density approach at the stage of freeze out in nuclear collisions. The isospin diffusion in the collisions is responsible for the neutron-rich cluster formation. The collective flows of nuclear clusters are consistent with the experimental data from FOPI collaboration. It is found that the influence of the hyperon-nucleon potential on the free hyperons is negligible, but available for the light hypernuclide formation. The directed and elliptic flows of $^{3}_{\Lambda}$H and $^{4}_{\Lambda}$H at incident energies of 2, 2.5, 3, 3.5 and 4 GeV/nucleon are investigated thoroughly and manifest the same structure with the nuclear clusters. The hypernuclear yields are produced in a wide rapidity and momentum regime with increasing the beam energy.