Hyperon Dynamics in Heavy-Ion Collisions near Threshold Energy
Ding-Chang Zhang , Hui-Gan Cheng , and Zhao-Qing Feng*
School of Physics and Optoelectronic Technology, South China University of Technology, Guangzhou 510641, China
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 $\varSigma$ 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 the nuclear medium. The $\varSigma^{-}/\varSigma^{+}$ ratio depends on the stiffness of nuclear symmetry energy, in particular in the high-energy region (above 500 MeV).
收稿日期: 2021-04-30
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出版日期: 2021-09-02
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2021, Vol. 38 
