Influence of Medium Correction of Nucleon-Nucleon Cross Section on Fragmentation

XING Yong-Zhong; LIU Jian-Ye; GUO Wen-Jun; LI Xi-Guo

Chinese Physics C> 2003, Vol. 27> Issue(5) : 421-425

Influence of Medium Correction of Nucleon-Nucleon Cross Section on Fragmentation

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,China3 Department of Physics,Tianshui Normal College,Gansu Tianshui 741000,China

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Abstract：
The influence of medium correction of isospin dependent nucleon nucleon (NN) cross section on fragmentation in heavy ion collisions at intermediate energies is studied by using the isospin dependent quantum molecular dynamical model. The results show that the medium correction of isospin dependent nucleon nucleon cross section enhances the sensitivity of the free nucleons emission and multiplicity of intermediate mass fragments on the isospin effects of NN cross section. The character of nuclear stopping that depends strongly on the isospin effect of NN cross section and weakly on the different forms of symmetry potential is not affected by the medium correction of NN cross section.And hence this charater of nuclear stopping stems mainly from the isospin effects of free nucleon nucleon cross section.

References

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. LI Bao-An.Phys.Rev.Lett.,2000,85:4221 2. LIU Jian-Ye,GUO Wen-Jun,WANG Shun-Jin et al.Phys.Rev.Lett.,2001,86:975;LIU Jian-Ye,YANG Yan-Fang.ZUO Wei et al.Phys.Rev.,2001,C63:054612;Chin.Phys.Lett.,2001,18(8):10403. LIU Jian-Ye,XING Yong-Zhong,ZUO Wei et al.Chin.Phys.Lett.,2002,19(8):1078;XING Yong-Zhong,LIUJianYe,GUO Wen-Jun et al.High Energy Phys.and Nucl.Phys.,2003,27(2):130(in Chinese)(邢永忠,刘建业,郭文军等.高能物理与核物理,2003,27(2):130)4. LI Q F,LI Z X,MAO G J.Phys.Rev.,2000,C62:014606;LI G.Q ,Machleidt R.Phys.Rev.,1994,C49:566;and the references therein5. Klakow D,Welke G,Bauer W.Phys.Rev.,1993,C48:19826. Chen K,Fraenkel Z,Friedlander G et al.Phys.Rev.,1968,166:9497. LI Qing-Feng,LI Zhu-Xia.Chin.Phys.Lett.,2002,19(3):321

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XING Yong-Zhong, LIU Jian-Ye, GUO Wen-Jun, LI Xi-Guo and Influence of Medium Correction of Nucleon-Nucleon Cross Section on Fragmentation[J]. Chinese Physics C, 2003, 27(5): 421-425.

XING Yong-Zhong, LIU Jian-Ye, GUO Wen-Jun, LI Xi-Guo and Influence of Medium Correction of Nucleon-Nucleon Cross Section on Fragmentation[J]. Chinese Physics C, 2003, 27(5): 421-425. shu

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Received: 2002-07-08
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Influence of Medium Correction of Nucleon-Nucleon Cross Section on Fragmentation

Corresponding author: XING Yong-Zhong,

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,China3 Department of Physics,Tianshui Normal College,Gansu Tianshui 741000,China

Received Date: 2002-07-08
Accepted Date: 1900-01-01
Available Online: 2003-05-05

Abstract: The influence of medium correction of isospin dependent nucleon nucleon (NN) cross section on fragmentation in heavy ion collisions at intermediate energies is studied by using the isospin dependent quantum molecular dynamical model. The results show that the medium correction of isospin dependent nucleon nucleon cross section enhances the sensitivity of the free nucleons emission and multiplicity of intermediate mass fragments on the isospin effects of NN cross section. The character of nuclear stopping that depends strongly on the isospin effect of NN cross section and weakly on the different forms of symmetry potential is not affected by the medium correction of NN cross section.And hence this charater of nuclear stopping stems mainly from the isospin effects of free nucleon nucleon cross section.