Hyperon Dynamics in Heavy-ion Collisions near threshold energy

Abstract

Within the framework of quantum molecular dynamics transport model, the isospin and in-medium effects on the hyperon production in the reaction of ${}^{197}$Au + ${}^{197}$Au are investigated thoroughly. A repulsive hyperon-nucleon potential from the chiral effective field theory is implemented into the model, which is related to the hyperon momentum and baryon density. The correction on threshold energy of the elementary hyperon cross section is taken into account. It is found that the $\Sigma$ yields are suppressed in the domain of midrapidity and kinetic energy spectra with the potential. The hyperons are emitted in the reaction plane because of the strangeness exchange reaction and reabsorption process in nuclear medium. The ${\Sigma }^{-}/{\Sigma }^{+}$ ratio depends on the stiffness of nuclear symmetry energy, in particular in the high-energy region (above 500 MeV).

arXiv comment5 pages, 4 figures

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• Systematics on production of superheavy nuclei $Z=119-122$ in fusion-evaporation reactions
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• Determination of neutron-skin thickness using configurational information entropy
• Azimuthal-sensitive three-dimensional HBT radius in Au-Au collisions at $E_{beam}=1.23$$A$ GeV by the IQMD model
• Hyperon dynamics and production of multi-strangeness hypernuclei in heavy-ion collisions at 3A GeV
• Directed flow of $\Lambda$ from heavy-ion collisions and hyperon puzzle of neutron stars