Nuclear Stopping as a Probe to Nucleon-Nucleon Cross Section in Heavy Ion Collisions

LIU Jian-Ye; GUO Wen-Jun; ZHAO Qiang; YANG Yan-Fang; ZUO Wei

Chinese Physics C> 2001, Vol. 25> Issue(4) : 336-342

Nuclear Stopping as a Probe to Nucleon-Nucleon Cross Section in Heavy Ion Collisions

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

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Abstract：
Based on the isospin dependence of quantum molecular dynamics with momentum dependent interaction, the dependence of symmetrical potential and isospin dependence of inmedium nucleon-nucleon cross section on the nuclear stopping were studied in wider beam energy region (45—150MeV/u) for four colliding systems with different ratios of neutron-proton.. The calculation results show that the nuclear stopping depends strongly on the isospin dependence of in medium nucleon-nucleon cross section σ^iso and weakly on symmetrical potential U^sym for the all of colliding systems in wider beam energy region studied here. It is suggested that the information on the isospin dependence of in-medium nucleon nucleon cross section could the extracted from the comparisons between the theoretical results and the experiment data on the nuclear stopping in the process of intermediate energy heavy ion collisions. The dependence of the nuclear stopping on σ^iso is very sensitive to beam energy E_L, and impact parameter b. The results also show that the effect of momentum dependence interaction on the nuclear stopping is important.

References

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LI Bao-An , Ko C M, Bauer W. Inter. Jour Mod. Phys. , 1998, E7(2) : 147-2292 LI Bao-An, Ko C M, REN Zhong-Zhou. Phys. Rev. Lett., 1997. 78: 16443 LI Bao-An, REN Zhong-Zhou, Ko C M et al. Phys. Rev. Lett. 1996, 76: 44924 ZHENG Y M, Ko C M. LI Bao-An et al. Phys. Rev. Lett. , 1999, 83(13) :25345 LIU Jian Ye, CHEN Bo, ZHAO Qiang et al. Nuclear Physics Review. 1999, 16(3) : 165(in Chinese)(刘建业, 陈波, 赵强等. 原子核物理评论, 1999,16(3): 165)6 LI Bao-An, Yennllo S J. Phys. Rev., 1995, C52:R17467 Bass S A, Konopka J, Bleicher M et al. Phys. Lett. 1994, B321:158 LI Bao-An, Yennello S J. Phys. Rev. , 1995, C52:R17469 Klakow D. Welke G, Bauer W. Phys. Rev. 1993, C48: 198210 Chen K, Fraenkel Z, Friedlander G et al. Phys. Rev. , 1968, 166:94911 CHEN Lie-Wen. GE Ling-Xiao, ZHANG Xiao-Dong et al. J. Phys., 1997. G23:211

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LIU Jian-Ye, GUO Wen-Jun, ZHAO Qiang, YANG Yan-Fang and ZUO Wei. Nuclear Stopping as a Probe to Nucleon-Nucleon Cross Section in Heavy Ion Collisions[J]. Chinese Physics C, 2001, 25(4): 336-342.

LIU Jian-Ye, GUO Wen-Jun, ZHAO Qiang, YANG Yan-Fang and ZUO Wei. Nuclear Stopping as a Probe to Nucleon-Nucleon Cross Section in Heavy Ion Collisions[J]. Chinese Physics C, 2001, 25(4): 336-342. shu

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Received: 2000-04-17
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

Nuclear Stopping as a Probe to Nucleon-Nucleon Cross Section in Heavy Ion Collisions

Corresponding author: LIU Jian-Ye,

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: 2000-04-17
Accepted Date: 1900-01-01
Available Online: 2001-04-05

Abstract: Based on the isospin dependence of quantum molecular dynamics with momentum dependent interaction, the dependence of symmetrical potential and isospin dependence of inmedium nucleon-nucleon cross section on the nuclear stopping were studied in wider beam energy region (45—150MeV/u) for four colliding systems with different ratios of neutron-proton.. The calculation results show that the nuclear stopping depends strongly on the isospin dependence of in medium nucleon-nucleon cross section σ^iso and weakly on symmetrical potential U^sym for the all of colliding systems in wider beam energy region studied here. It is suggested that the information on the isospin dependence of in-medium nucleon nucleon cross section could the extracted from the comparisons between the theoretical results and the experiment data on the nuclear stopping in the process of intermediate energy heavy ion collisions. The dependence of the nuclear stopping on σ^iso is very sensitive to beam energy E_L, and impact parameter b. The results also show that the effect of momentum dependence interaction on the nuclear stopping is important.