Isospin Effects in the Isospin Fractionation Process in Intermediate Energy HeavyIon Collisions

XING Yong-Zhong; LIU Jian-Ye; GUO Wen-Jun

Chinese Physics C> 2004, Vol. 28> Issue(4) : 403-407

Isospin Effects in the Isospin Fractionation Process in Intermediate Energy HeavyIon Collisions

Institute for the Theory of Modern Physics,Tianshui Normal University,Tianshui 741000,China2 Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China3 Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator,Lanzhou 730000,China

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Abstract：
Based on the isospin dependent quantum molecular dynamics model we investigated the isospin effects of isospin fractionation (N/Z)_gas/(N/Z)_liq from the neutron-proton ratio of colliding system and impact parameter. Here (N/Z)_gasand (N/Z)_liq is the neutron-proton ratio of nucleon emission for gas phase and that of fragment emission for liquid phase, respectively. Our results show that the (N/Z)_gas/(N/Z)_liq increases with the neutron-proton ratio of colliding systems when the system mass, incident energy and impact parameters are fixed. For the neutron-rich systems, the (N/Z)_gas/(N/Z)_liq depends sensitively to the form of symmetry potential and weakly on the isospin effect of the in-medium nucleon-nucleon cross section; For the neutron-poor colliding system, however, the (N/Z)_gas/(N/Z)_liq is not sensitive to both the form of symmetry potential and the isospin effect of the in-medium nucleon-nucleon cross section. We also found that the dependence of (N/Z)_gas/(N/Z)_liq on the impact parameter is not obvious. Detailed discussion and explanation for leading to these results are presented in the paper. According to these results, we propose that (N/Z)_gas/(N/Z)_liq can be directly compared with the experimental data to get the information about symmetry potential.

References

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XING Yong-Zhong, LIU Jian-Ye and GUO Wen-Jun. Isospin Effects in the Isospin Fractionation Process in Intermediate Energy HeavyIon Collisions[J]. Chinese Physics C, 2004, 28(4): 403-407.

XING Yong-Zhong, LIU Jian-Ye and GUO Wen-Jun. Isospin Effects in the Isospin Fractionation Process in Intermediate Energy HeavyIon Collisions[J]. Chinese Physics C, 2004, 28(4): 403-407. shu

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Received: 2003-07-10
Revised: 1900-01-01

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Isospin Effects in the Isospin Fractionation Process in Intermediate Energy HeavyIon Collisions

Corresponding author: XING Yong-Zhong,

Institute for the Theory of Modern Physics,Tianshui Normal University,Tianshui 741000,China2 Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China3 Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator,Lanzhou 730000,China

Received Date: 2003-07-10

Accepted Date: 1900-01-01

Available Online: 2004-04-05

Abstract: Based on the isospin dependent quantum molecular dynamics model we investigated the isospin effects of isospin fractionation (N/Z)_gas/(N/Z)_liq from the neutron-proton ratio of colliding system and impact parameter. Here (N/Z)_gasand (N/Z)_liq is the neutron-proton ratio of nucleon emission for gas phase and that of fragment emission for liquid phase, respectively. Our results show that the (N/Z)_gas/(N/Z)_liq increases with the neutron-proton ratio of colliding systems when the system mass, incident energy and impact parameters are fixed. For the neutron-rich systems, the (N/Z)_gas/(N/Z)_liq depends sensitively to the form of symmetry potential and weakly on the isospin effect of the in-medium nucleon-nucleon cross section; For the neutron-poor colliding system, however, the (N/Z)_gas/(N/Z)_liq is not sensitive to both the form of symmetry potential and the isospin effect of the in-medium nucleon-nucleon cross section. We also found that the dependence of (N/Z)_gas/(N/Z)_liq on the impact parameter is not obvious. Detailed discussion and explanation for leading to these results are presented in the paper. According to these results, we propose that (N/Z)_gas/(N/Z)_liq can be directly compared with the experimental data to get the information about symmetry potential.

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Isospin Effects in the Isospin Fractionation Process in Intermediate Energy HeavyIon Collisions

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