Effect of Coulomb Interaction on Isospin Fractionation Process

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

Chinese Physics C> 2004, Vol. 28> Issue(8) : 850-853

Effect of Coulomb Interaction on Isospin Fractionation Process

Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator,Lanzhou 730000,China2 Graduate School of the Chinese Academy of Sciences,Beijing 100039,China3 Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China4 Institute for the Theory of Modern Physics,Tianshui Normal College,Tianshui 741000,China

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Abstract：
We studied the effect of Coulomb interaction on the isospin fractionation in intermediate energy heavy ion collisions by using isospin dependence quantum molecular dynamics model (IQMD).The results show that Coulomb interaction reduces the isospin fractionation process whatever the system mass,beam energy and system neutron proton ratio are,because Coulomb interaction is repulsive for proton.The more bound protons became free under Coulomb interaction,which produces neutron poor gas phase and neutron rich liquid phase,thus isospin fractionation degree is weaken.On the contrary,the symmetry potential is repulsive for neutrons and attractive for protons in neutron rich systems.The bound neutrons more than protons became free,which produces neutron rich gas phase and neutron poor liquid phase,so the isospin fractionation degree increases.Total effects of the Coulomb interaction and symmetry potential make the isospin fractionation degree to be in between those induced by themselves individually.

References

[1]

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GUO Wen-Jun, LIU Jian-Ye and XING Yong-Zhong. Effect of Coulomb Interaction on Isospin Fractionation Process[J]. Chinese Physics C, 2004, 28(8): 850-853.

GUO Wen-Jun, LIU Jian-Ye and XING Yong-Zhong. Effect of Coulomb Interaction on Isospin Fractionation Process[J]. Chinese Physics C, 2004, 28(8): 850-853. shu

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Received: 2003-11-29
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

Effect of Coulomb Interaction on Isospin Fractionation Process

Corresponding author: GUO Wen-Jun,

Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator,Lanzhou 730000,China2 Graduate School of the Chinese Academy of Sciences,Beijing 100039,China3 Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China4 Institute for the Theory of Modern Physics,Tianshui Normal College,Tianshui 741000,China

Received Date: 2003-11-29

Accepted Date: 1900-01-01

Available Online: 2004-08-05

Abstract: We studied the effect of Coulomb interaction on the isospin fractionation in intermediate energy heavy ion collisions by using isospin dependence quantum molecular dynamics model (IQMD).The results show that Coulomb interaction reduces the isospin fractionation process whatever the system mass,beam energy and system neutron proton ratio are,because Coulomb interaction is repulsive for proton.The more bound protons became free under Coulomb interaction,which produces neutron poor gas phase and neutron rich liquid phase,thus isospin fractionation degree is weaken.On the contrary,the symmetry potential is repulsive for neutrons and attractive for protons in neutron rich systems.The bound neutrons more than protons became free,which produces neutron rich gas phase and neutron poor liquid phase,so the isospin fractionation degree increases.Total effects of the Coulomb interaction and symmetry potential make the isospin fractionation degree to be in between those induced by themselves individually.

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Effect of Coulomb Interaction on Isospin Fractionation Process

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通讯作者: 陈斌, bchen63@163.com

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