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

Abstract
HTML
Reference
Related

PDF

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

[1]

. 　LI B A , KO C M, Bauer W. Int . J . Mod. Phys. , 1998 , E7 :1472.　LI B A , Udo Schroder W. Isospin Physics in Heavy2Ion Collisions at Intermediate Energies ( book) , Nova Science Publishers , Inc (2001 ,New York)3.　Kunde G J et al . Phys. Rev. Lett . , 1996 , 77 :28974.　Miller M L et al . Phys. Rev. Lett . , 1999 , 82 :13995.　XU H et al . Phys. Rev. Lett . , 2002 , 85 : 716 ; Tsang M B et al .Phys. Rev. Lett . , 2001 , 86 :5023 ; Yennello S J et al . Nucl . Phys. A(to be published)6.　Udo Schroder W et al . Nucl . Phys. , 2001 , A681 :418c7.　Sobotka L G et al . Phys. Rev. , 1994 , C55 : R1272 ; 2000 , C62 :0316038.　Rami F et al . Phys. Rev. Lett . , 2000 , 84 :11209.　LI B A , Phys. Rev. Lett . , 2000 , 85(20) :422110.　LI B A , KO CM, REN Z Z et al . Phys. Rev. Lett . , 1997 , 78 :164411.　LIU Jian2Ye , GUO Wen2Jun , WANG Shun2Jin et al . Phys. Rev.Lett . , 2001 , 86 (6) :975 —978 ; YANG Yan2Fang , LIUJian2Ye , ZUOWei , GUO Wen2Jun et al . Chin. Phys. Lett . , 2001 , 18(8) :104012.　LIU Jian-Ye , GUO Wen-Jun , WANG Shun-Jin et al . Nucl . Phys. ,2001 , A687 :47513.　LIU Jian-Ye , GUO Wen-Jun , XING Yong-Zhong et al . Phys. Lett . ,2002 , B540 :213 ; LIU Jian-Ye , GUO Wen-Jun , XING Yong-Zhong etal . Phys. Rev. , 2003 , C67 :02460814.　Colonna M, Di Toro M et al . Phys. Rev. , 1998 , C57 :1410 —1415 ;Di Toro M et al . Nucl . Phys. , 2001 , A681 :426c15.　Baran V , Colonna M, Di Toro Met al . Nucl . Phys. , 2002 , A703 :60316.　LI B A. Phys. Rev. , 2001 , C64 :05464017.　Bertsch G F , Gupta S D. Phys. Rep. , 1988 , 160 :199118.　Aichelin J et al . Phys. Rev. Lett . , 1987 , 58 :192619.　Aichelin J et al . Phys. Rev. , 1988 , C37 :245120.　SONG H Q et al . J . Phys. , 1990 , G16 : 1861 ; SONG H Q et al .Chin. Phys. Lett . , 1989 , 7 :117

[1]	LIU Jian-Ye , GUO Wen-Jun , Xing Yong-Zhong , LI Xi-Guo . Isospin Effect of Momentum Dependent Interaction in Heavy Ion Collisions. Chinese Physics C, 2005, 29(5): 456-460.
[2]	GUO Wen-Jun , LIU Jian-Ye , XING Yong-Zhong . Effect of Coulomb Interaction on Isospin Fractionation Process. Chinese Physics C, 2004, 28(8): 850-853.
[3]	XING Yong-Zhong , LIU Jian-Ye , GUO Wen-Jun . Liquid-Gas Phase Transition and Isospin Fractionation in Intermediate Energy Heavy Ion Collisions. Chinese Physics C, 2004, 28(6): 607-610.
[4]	LI Zhu-Xia , ZHANG Ying-Xun , LI Qing-Feng , ZHAO Kai , WU Xi-Zhen . Isospin Effect in Intermediate Energy Heavy Ion Collisions. Chinese Physics C, 2004, 28(12): 1343-1348.
[5]	HU Rong-Jiang , WU He-Yu , JIN Gen-Ming , ZHU Yong-Tai , LI Song-Lin , XIAO Zhi-Gang , WANG Hong-Wei , DUAN Li-Min , LI Zu-Yu , YIN Xu , WANG Su-Fang , ZHANG Bao-Guo , WEI Zhi-Yo , , , . Isospin Effect of Charged Particle Multiplicity in Intermediate Energy Heavy Ion Collisions. Chinese Physics C, 2003, 27(11): 990-994.
[6]	GUO Wen-Jun , LIU Jian-Ye , XING Yong-Zhong , ZUO Wei , LI Xi-Guo . Isospin Fractionation Process in Intermediate Energy Heavy Ion Collisions. Chinese Physics C, 2003, 27(10): 897-900.
[7]	LI Qing-Feng , LI Zhu-Xia . Probing Equilibration in HICs and Symmetry Energy by Using Isospin-Related Observables. Chinese Physics C, 2002, 26(9): 926-932.
[8]	XING Yong-Zhong , LIU Jian-Ye , GUO Wen-Jun , ZUO Wei , LI Xi-Guo . Role of Momentum Dependent Interaction on the Isospin Effects of Fragmentations and Dissipations at Intermediate Energy Heavy Ion Collisions. Chinese Physics C, 2002, 26(S1): 63-72.
[9]	GUO Wen-Jun , LIU Jian-Ye , ZUO Wei , XING Yong-Zhong , LI Xi-Guo , LI Zeng-Hua . Isospin Effect of Neutron (Proton) Emission Number in Intermediate Energy Heavy Ion Collisions. Chinese Physics C, 2002, 26(12): 1264-1270.
[10]	YANG Yan-Fang , LIU Jian-Ye , ZUO Wei , GUO Wen-Jun , ZHAO Qiang . Entrance Channel Dependence of the Isospin Effects of the Nuclear Stopping in Intermediate Energy Heavy Ion Collisions. Chinese Physics C, 2001, 25(8): 765-771.
[11]	ZHAO Qiang , GUO Wen-Jun , LIU Jian-Ye , ZUO Wei , WANG Shun-Jin . Isospin Dependence of Preequilibrium Nucleon Emission in Intermediate Energy Heavy Ion Collision. Chinese Physics C, 2001, 25(3): 244-250.
[12]	ZHAO Qiang , CHEN Bo , LIU JianYe , ZHANG FengShou , WANG ShunJin , CHEN LieWen , ZUO Wei . Probable Observable of Isospin Dependent Nucleon-Nucleon Cross Section in Inter Mediate Energy Heavy Ion Collisions. Chinese Physics C, 2000, 24(5): 426-430.
[13]	CHEN Bo , ZHAO Qiang , LIU JianYe , ZHANG FengShou , WANG ShunJin , CHEN LieWen , ZUO Wei . A Sensitive Probe for Isospin-Dependent Nucleon-Nucleon Cross Section in Intermediate Energy Heavy Ion Collision. Chinese Physics C, 2000, 24(4): 326-330.
[14]	FANG DeQing , SHEN WenQing , FENG Jun , CAI XiangZhou , SU QianMin , MA YuGang . Isospin Effect of Fragmentation Reaction and Its Disappearance in Intermediate Energy Heavy Ion Collisions. Chinese Physics C, 2000, 24(10): 949-954.
[15]	ZHAO Qiang , LIU JianYe , ZHANG FengShou , WANG ShunJin , ZUO Wei , CHEN LieWen . Isospin Effect in Multifragmentation Process of Heavy Ion Collisions at Intermediate Energy. Chinese Physics C, 2000, 24(11): 1024-1029.
[16]	Chen Liewen , Zhang Fengshou , Jin Genming . Isospin Effects on Balance Energy in HIC at Intermediate Energies. Chinese Physics C, 1999, 23(5): 469-474.
[17]	Chu Zili , Zheng Yuming . Simulation of Heavy-Ion Collision With Isospi-Separated RVUU Model. Chinese Physics C, 1998, 22(5): 429-433.
[18]	Chen Liewen , Zhang Fengshou , Zeng Xianghua , Jin Genming . Isospin Effects on Collective Flow in HIC at Intermediate Energies. Chinese Physics C, 1998, 22(11): 1035-1041.
[19]	Chen Liewen , Zhang Xiaodong , Ge Lingxiao . Isospin Effects on Pre-equilibrium NucleonEmission in Heavy Ion Collisions. Chinese Physics C, 1996, 20(12): 1091-1096.
[20]	Zhu Quanling , Ge Lingxiao , Zhang Xiaodong . Isospin Effects on Dynamics of Heavy Ion Collisions. Chinese Physics C, 1994, 18(9): 853-857.

Access

Get Citation

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

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

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

Article Metric

Article Views(2771)
PDF Downloads(536)
Cited by(0)

Policy on re-use

To reuse of subscription content published by CPC, the users need to request permission from CPC, unless the content was published under an Open Access license which automatically permits that type of reuse.

通讯作者: 陈斌, bchen63@163.com

1.
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.

HTML

Reference (1)

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

Abstract：

References

Access

Article Metrics

Metrics

通讯作者: 陈斌, bchen63@163.com

Email This Article