摘要
Within the framework of the semiclassical Boltzmann-Uehling-Uhlenbeck transport model,we investigate the effects of symmetry energy on the sub-threshold pion using the isospin MDI interaction with the stiff and soft symmetry energies in the central collision of 48Ca+48Ca at the incident beam energies of 100,150,200,250 and 300 MeV/nucleon.We find that the ratio ofπ- /π+ of sub-threshold charged pion production is greatly sensitive to the symmetry energy,particularly around 100 MeV/nucleon energies.Large sensitivity of sub-threshold charged pion production to nuclear symmetry energy may reduce uncertainties of probing nuclear symmetry energy via heavy-ion collision.
作者
张芳
刘旸
雍高产
左维
ZHANG Fang;LIU Yang;YONG Gao-Chan;ZUO Wei(School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000)
基金
Supported in part by the National Natural Science Foundation of China under Grant Nos 10875151,10947109,11175219 and 10740420550
the Knowledge Innovation Project of Chinese Academy of Sciences(KJCX2-EW-N01)
the National Basic Research Program of China under Grant No 2007CB815004
the CAS/SAFEA International Partnership Program for Creative Research Teams(CXTD-J2005-1)
the Fundamental Research Fund for Physics and Mathematic of Lanzhou University LZULL200908
the Fundamental Research Funds for the Central Universities(LZUJBKY-2010-160).