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Chinese Physics C> 2002, Vol. 26> Issue(7) : 690-695 

Importance of Momentum Dependence Interactionon the Isospin Dependence of the Mean Field

  •  Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator,Lanzhou 730000, China2 Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000, China

  • The role of momentum dependence equation of state on the nuclear stoppings coming from the isospin dependence of the mean field (one-body dissipation) is studied by using the isospin dependence quantum molecular dynamics (IQMD). A detail study indicates that the difference between the nuclear stoppings coming from the isospin dependence of the mean field (symmetry potential) and the isospin independence of the mean field in the presence of momentum dependence interaction is larger than that without momentum dependence interaction. But the important point is that the enhancement of the difference between nuclear stoppings from the isospin dependence of two-body dissipation is larger than that from the isospin dependence of one-body dissipation in the presence of momentum dependence interaction. Namely in comparison with each other, the momentum dependence equation of state enhances the sensitivity of nuclear stopping on the isospin dependence of in-medium nucleon-nucleon cross section and reduces the sensitivity of the nuclear stopping on the symmetry potential, leading to that the nuclear stopping depends strongly on the isospin dependence of nucleon-nucleon cross section and weakly on the symmetry potential. In this case, one can make use of the nuclear stopping as a probe for extracting the information of in-medium N-N cross section in HIC if MDI is taken into account.
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    [1] . LI Bao-An, Ko Che-Ming et al. Inter. Jour. Mod. Phys.,1998,E7(2):147 2. LIU Jian-Ye, GUO Wen-Jun, WANG Shun-Jin et al. Phys. Rev. Lett.,2001,86:9753. LIU Jian-Ye, YANG Yan-Fang, ZUO Wei et al. Phys. Rev.,2001,C63:054612 4. YANG Yan-Fang, LIU Jian-Ye, ZUO Wei et al. Chinese Physics Letter.,2001,18(8):10405. Aichelin J, Peilert G, Bohnet A et al. Phys. Rev.,1988,C37:2451 6. Peilert G, Stocher H, Greiner W. Phys. Rev.,1989,C39:14027. LIU Hang, LIU Jian-Ye. Z. Phys.,1996,A345:311 8. Dorso C, Duarte S, Randrup J. Phys. Lett.,1987,B188:2879. Aichelin J, Rosenhauer A, Peilert G et al. Phys. Rev. Lett.,1987,58:1926 10. Reinhard P G. Computational Nuclear Physics 1. In:Edited by K. Langanke, J. A. Maruhn, S. E. Koonin. Germany:Springer-Verlag,1991.28—50 11. Klakow D, Welke G, Bauer W. Phys. Rev.,1993,C48:1982 12. Chen K, Fraenkel Z et al. Phys. Rev. 1968,166:94913. Huang M J et al. Phys. Rev. Lett.,1996,77:3739 14. Westfall G D et al. Phys. Rev. Lett.,1993,71:1986 15. YANG Yan-Fang, LIU Jian-Ye, GUO Wen-Jun et al. High Energy Phys. and Nucl. Phys.,2002,26:377(in Chinese)(杨艳芳,刘建业,郭文军等.高能物理与核物理,2002,26:377)

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GUO Wen-Jun, LIU Jian-Ye, YANG Yan-Fang, ZUO Wei and ZHAO Qiang. Importance of Momentum Dependence Interactionon the Isospin Dependence of the Mean Field[J]. Chinese Physics C, 2002, 26(7): 690-695.
GUO Wen-Jun, LIU Jian-Ye, YANG Yan-Fang, ZUO Wei and ZHAO Qiang. Importance of Momentum Dependence Interactionon the Isospin Dependence of the Mean Field[J]. Chinese Physics C, 2002, 26(7): 690-695. shu
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Received: 2001-07-30
Revised: 1900-01-01
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Importance of Momentum Dependence Interactionon the Isospin Dependence of the Mean Field

    Corresponding author: GUO Wen-Jun,
  • Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator,Lanzhou 730000, China2 Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000, China
  • Received Date: 2001-07-30
  • Accepted Date: 1900-01-01
  • Available Online: 2002-07-05

Abstract: The role of momentum dependence equation of state on the nuclear stoppings coming from the isospin dependence of the mean field (one-body dissipation) is studied by using the isospin dependence quantum molecular dynamics (IQMD). A detail study indicates that the difference between the nuclear stoppings coming from the isospin dependence of the mean field (symmetry potential) and the isospin independence of the mean field in the presence of momentum dependence interaction is larger than that without momentum dependence interaction. But the important point is that the enhancement of the difference between nuclear stoppings from the isospin dependence of two-body dissipation is larger than that from the isospin dependence of one-body dissipation in the presence of momentum dependence interaction. Namely in comparison with each other, the momentum dependence equation of state enhances the sensitivity of nuclear stopping on the isospin dependence of in-medium nucleon-nucleon cross section and reduces the sensitivity of the nuclear stopping on the symmetry potential, leading to that the nuclear stopping depends strongly on the isospin dependence of nucleon-nucleon cross section and weakly on the symmetry potential. In this case, one can make use of the nuclear stopping as a probe for extracting the information of in-medium N-N cross section in HIC if MDI is taken into account.

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