2009/04/30 by Ming Zhang, Zhigang Xiao, Zhi-Gang Xiao +4 · 38 citations
Chemistry · Physics and Astronomy · #Atomic physics #Beam (structure) #Beam energy #Chemistry #Crystallography #Energy (signal processing) #High-Energy Particle Collisions Research #Neutron #Nuclear physics #Nuclear physics research studies #Nucleon #Optics #Particle physics #Physics #Pion #Proton #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #nucl-ex #nucl-th
paper · pdf · doi:10.1103/physrevc.80.034616
published in Physical Review C 80(3) (American Institute of Physics) · New results and discussions added. Version to appear in PRC (2009)
arxiv created 2009/09/20 · openalex publication_date 2009/09/28 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A systematic study of the \ensuremathπ^\ensuremath-/\ensuremathπ+ 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 \ensuremathπ^\ensuremath-/\ensuremathπ+ ratio in head-on collisions of 48Ca+48Ca, 124Sn+124Sn, and 197Au+197Au at beam energies from 0.25 to 0.6 GeV/nucleon increases with increasing the system size or decreasing the beam energies. A comprehensive analysis of the dynamical isospin fractionation and the \ensuremathπ^\ensuremath-/\ensuremathπ+ ratio as well as their time evolution and spatial distributions demonstrates clearly that the \ensuremathπ^\ensuremath-/\ensuremathπ+ ratio is an effective probe of the high-density behavior of the nuclear symmetry energy.