中国物理B ›› 2006, Vol. 15 ›› Issue (8): 1738-1745.doi: 10.1088/1009-1963/15/8/018

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Isospin- and momentum-dependent interaction in isospin-dependent quantum molecular dynamics

郭文军1, 任中洲2, 邢永忠3, 刘建业4, 左　维5, 李希国5   

  1. (1)Department of Physics, Nanjing University Nanjing 210008, China; (2)Department of Physics, Nanjing University Nanjing 210008, China ;Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China; (3)Department of Physics, Tianshui Normal College,Gansu, Tianshui 741000, China;Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China; (4)Department of Physics, Tianshui Normal College,Gansu, Tianshui 741000, China;Institute of Modern Physics, Chinese Academy of Sciences,Lanzhou 730000, China,Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou; (5)Institute of Modern Physics, Chinese Academy of Sciences,Lanzhou 730000, China; Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China
  • 收稿日期:2005-12-08 修回日期:2006-04-18 出版日期:2006-08-20 发布日期:2006-08-20
  • 基金资助:
    Project supported by the State Key Program of Basic Research of China(Grant No G2000077400), the Major program of the National Natural Science Foundation of China (Grant Nos 10435080 and 105350101), the National Natural Science Foundation of China (Grant Nos 10447006, 10575075, 10125521 and 10447113), the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No KJCX2-SW-N02), Jiangsu Planned Projects for Postdoctoral Research Funds and China Postdoctoral Science Foundation.

Isospin- and momentum-dependent interaction in isospin-dependent quantum molecular dynamics

Liu Jian-Ye(刘建业)a)b)d), Guo Wen-Jun(郭文军)c), Ren Zhong-Zhou(任中洲)c)d), Xing Yong-Zhong(邢永忠)a)d), Zuo Wei(左维)b)d), and Lee Xi-Guo(李希国)b)d)   

  1. a Department of Physics, Tianshui Normal College, Gansu, Tianshui 741000, China; b Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China; c Department of Physics, Nanjing University Nanjing 210008, China; d Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China
  • Received:2005-12-08 Revised:2006-04-18 Online:2006-08-20 Published:2006-08-20
  • Supported by:
    Project supported by the State Key Program of Basic Research of China(Grant No G2000077400), the Major program of the National Natural Science Foundation of China (Grant Nos 10435080 and 105350101), the National Natural Science Foundation of China (Grant Nos 10447006, 10575075, 10125521 and 10447113), the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No KJCX2-SW-N02), Jiangsu Planned Projects for Postdoctoral Research Funds and China Postdoctoral Science Foundation.

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摘要： 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.

关键词: heavy ion collision, isospin fractionation ratio, isospin and momentum dependent interaction, isospin effect

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.

Key words: heavy ion collision, isospin fractionation ratio, isospin and momentum dependent interaction, isospin effect

中图分类号:  (Low and intermediate energy heavy-ion reactions)

  • 25.70.-z
21.65.-f (Nuclear matter)