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.

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

References in corpus (2)

• Systematics of pion emission in heavy ion collisions in the 1A GeV regime
• Spinodal decomposition of low-density asymmetric nuclear matter

Cited by in corpus (6)

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• The symmetry energy in nuclear reactions
• Disentangling effects of collision geometry and symmetry energy in U+U collisions
• Neutron-proton elliptic flow in Au + Au