High-density symmetry energy from subthreshold hyperon production in heavy-ion collisions

Abstract

The hyperon dynamics in heavy-ion collisions near threshold energy has been investigated within the quantum molecular dynamics transport model. The isospin and momentum dependent hyperon-nucleon potential and the threshold energy correction on the hyperon elementary cross section are included in the model. It is found that the high-density symmetry energy is dependent on the isospin ratios ${\Sigma }^{-}/{\Sigma }^{+}$ and ${\Xi }^{-}/{\Xi }^0$, in particular in the domain of high kinetic energies. The isospin diffusion in heavy-ion collisions influences the neutron/proton ratio in the high-density region. The ${\Sigma }^{-}/{\Sigma }^{+}$ ratio depends on the stiffness of symmetry energy, in particular at the beam energy below the threshold value (E${}_{th}$=1.58 GeV), i.e., the kinetic energy spectra of the single ratios, excitation functions and energy spectra of the double ratios in the isotopic reactions of ${}^{108}$Sn + ${}^{112}$Sn, ${}^{112}$Sn + ${}^{112}$Sn, ${}^{124}$Sn + ${}^{124}$Sn and ${}^{132}$Sn + ${}^{124}$Sn. The double strangeness ratio ${\Xi }^{-}/{\Xi }^0$ weakly depends on the symmetry energy because of the hyperon-hyperon collision mainly contributing the $\Xi$ production below the threshold energy (E${}_{th}$ = 3.72 GeV).

arXiv comment7 pages, 6 figures

References in corpus (24)

• Shapiro delay measurement of a two solar mass neutron star
• A Massive Pulsar in a Compact Relativistic Binary
• Relativistic Shapiro delay measurements of an extremely massive millisecond pulsar
• The NANOGrav Nine-year Data Set: Mass and Geometric Measurements of Binary Millisecond Pulsars
• Transport-theoretical Description of Nuclear Reactions
• Strangeness in nuclear physics
• Production of light nuclei, hypernuclei and their antiparticles in relativistic nuclear collisions
• Hyperon Puzzle: Hints from Quantum Monte Carlo Calculations
• Strangeness Production close to Threshold in Proton-Nucleus and Heavy-Ion Collisions
• Baryon-baryon interactions in the SU6 quark model and their applications to light nuclear systems
• The Juelich hyperon-nucleon model revisited
• Hyperon-nucleon three-body forces and strangeness in neutron stars
• Momentum dependence of the symmetry potential and its influence on nuclear reactions
• Hyperons in nuclear matter from SU(3) chiral effective field theory
• Impact of chiral hyperonic three-body forces on neutron stars
• Nuclear dynamics and particle production near threshold energies in heavy-ion collisions
• Nuclear in-medium effects and collective flows in heavy-ion collisions at intermediate energies
• A study of hyperons in nuclear matter based on chiral effective field theory
• Hyperon-nucleon interaction in chiral effective field theory at next-to-next-to-leading order
• Directed flow of $\Lambda$ in high-energy heavy-ion collisions and $\Lambda$ potential in dense nuclear matter
• Dynamics of strangeness and collective flows in heavy-ion collisions near threshold energies
• Double strangeness ${\Xi }^{-}$ production as a probe of nuclear equation of state at high densities
• Proton and neutron density distributions at supranormal density in low- and medium-energy heavy-ion collisions
• Formation and dynamics of exotic hypernuclei in heavy-ion collisions