Isospin- and momentum-dependent interaction in isospin-dependent quantum molecular dynamics |
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Authors: | Liu Jian-Ye Guo Wen-Jun Ren Zhong-Zhou Xing Yong-Zhong Zuo Wei and Lee Xi-Guo |
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Institution: | Department of Physics, Tianshui Normal College, Gansu, Tianshui 741000, China; Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China; Department of Physics, Nanjing University Nanjing 210008, China; Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China |
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Abstract: | An isospin-dependent quantum molecular dynamical model (IQMD) is developed, with the
isospin degree of freedom in the momentum-dependent interaction(MDI) included in
IQMD, to obtain an isospin- and momentum-dependent interaction (IMDI) in IQMD. We
investigate the effect of IMDI on the isospin fractionation ratio and its dynamical
mechanism in the intermediate energy heavy ion collisions. It is found that the IMDI
induces the significant reductions in the isospin fractionation ratio for all of
beam energies, impact parameters, neutron--proton ratios and mass number of
colliding systems. However, the strong dependence of isospin fractionation ratio on
the symmetrical potential is preserved, with the isospin degree of freedom included
in the MDI, i.e. the isospin fractionation ratio is still a good probe for
extracting the information about the equation of state of isospin asymmetrical
nuclear matter. |
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Keywords: | heavy ion collision isospin fractionation ratio isospin and momentum dependent interaction isospin effect |
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