A systematic study of the ${\pi }^{-}/{\pi }^{+}$ ratio in heavy-ion collisions with the same neutron/proton ratio but different masses

Abstract

A systematic study of the ${\pi }^{-}/{\pi }^{+}$ ratio in heavy-ion collisions with the same neutron/proton ratio but different masses can help single out effects of the nuclear mean field on pion production. Based on simulations using the IBUU04 transport model, it is found that the ${\pi }^{-}$ / ${\pi }^{+}$ ratio in head-on collisions of ${}^{48}$Ca+${}^{48}$Ca, ${}^{124}$Sn +${}^{124}$Sn and ${}^{197}$Au+${}^{197}$Au at beam energies from 0.25 to 0.6 \agev increases with increasing the system size or decreasing the beam energies. A comprehensive analysis of the dynamical isospin fractionation and the \rpi ratio as well as their time evolution and spatial distributions demonstrates clearly that the \rpi ratio is an effective probe of the high-density behavior of the nuclear symmetry energy.

arXiv commentNew results and discussions added. Version to appear in PRC (2009)

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Cited by in corpus (18)

• Symmetry Energy II: Isobaric Analog States
• Comparison of heavy-ion transport simulations: Collision integral with pions and $\Delta$ resonances in a box
• Effects of short-range correlation reduced kinetic symmetry energy in heavy-ion collisions at intermediate energies
• Probing isospin- and momentum-dependent nuclear effective interactions in neutron-rich matter
• Energy dependence of pion in-medium effects on π^-/π^+ ratio in heavy-ion collisions
• Probing the density dependence of symmetry energy via multifragmentation at sub-saturation densities
• Triton-${}^3$He relative and differential flows as probes of the nuclear symmetry energy at supra-saturation densities
• Probing nuclear symmetry energy at high densities using pion, kaon, eta and photon productions in heavy-ion collisions
• Isospin-dependent pion in-medium effects on charged pion ratio in heavy ion collisions
• Sensitivity of neutron to proton ratio toward the high density behavior of symmetry energy in heavy-ion collisions
• Double strangeness ${\Xi }^{-}$ production as a probe of nuclear equation of state at high densities
• Effects of nuclear symmetry energy on eta meson production and its rare decay to the dark U-boson in heavy-ion reactions
• Effects of symmetry energy in ${}^{132}\mathrm{Sn}{+}^{124}\mathrm{Sn}$ reaction at 300 MeV/nucleon
• The symmetry energy in nuclear reactions
• Determination of the density region of the symmetry energy probed by the ${\pi }^{-}/{\pi }^{+}$ ratio
• Probing nuclear symmetry energy with the sub-threshold pion production
• Disentangling effects of collision geometry and symmetry energy in U+U collisions
• Neutron-proton elliptic flow in Au + Au