Isospin Dependence of Preequilibrium Nucleon Emission in Intermediate Energy Heavy Ion Collision

ZHAO Qiang; GUO Wen-Jun; LIU Jian-Ye; ZUO Wei; WANG Shun-Jin

Chinese Physics C> 2001, Vol. 25> Issue(3) : 244-250

Isospin Dependence of Preequilibrium Nucleon Emission in Intermediate Energy Heavy Ion Collision

Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China2 Institute of Modern Physics, The Chinese Academy of Science, Lanzhou 730000, China3 Institute of Modern Physics, South West Jiaotong University, Chengdu 610031, China

Abstract
HTML
Reference
Related

PDF

Abstract：
The isospin dependence of preequilibrium nucleon emission for the neutron-deficient colliding system and neutron-rich system has been studied in the wide beam energy region. The calculation results show that the ratio of preequilibrium emission neutrons to protons is sensitive to the symmetrical potential and insensitive to the isospin dependence of in-medium nucleonnucleon collision cross section from low beam energy region to high energy region, in which nucleonnucleon collision dynamics is dominant, namely the isospin dependence of in medium nucleonnucleon cross section excites neutron and proton to be emitted with about the same probability in wide beam energy region. At the same time, the neutrons and protons are excited to be emitted with the same probability for Pauli potential, momentum dependence interaction and impact parameter, even though their effects on preequilibrium neutron number and proton number are obvious. The ratio of preequilibrium neutrons to protons for neutron rich colliding system is larger than the initial value of neutron proton ratio of colliding system, but that for neutron-deficient system is less than the initial value. In this case, one can compare the theoretical results with the experimental data systematically to extract information on the symmetrical potential.

References

[1]

Hussein M S, Rego R A, Bedmi C A. Phys. Rep. , 1991, 201:2793 LI Bao-An, REN Zhong-Zhou, KO Che-Mi et al. Phys. Rev. Lett. , 1996, 76:44924 Pak R, Beneson W, Bjark 0 et al. Phys. Rev. Lett. , 1997, 78:10225 Pak R, LI Bao-An, Beneson W et al. Phys. Rev. Lett. , 1997, 78: 10266 LIU Jim-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)7 LI Bao-Aa, KO Che Ming, REN Zhong-Zhou. Phys. Rev. Lett., 1997, 78:16448 CHEN Lie-Wen, GE Li-Xiao, ZHANG Xiao-Dong et al. J. Phys. , 1997, G123:2119 LIU Hang, LIU Jim-Ye. Z. Phys., 1996, A345:31110 Rlakow D R, Wilke G, Bauer W. Phys. Rev. , 1993, C48:198211 Hilscher D, Rossner H, Garnp A et al. Phys. Rev. , 1987, C36: 20812 Polster D, Hilscher H, Rossner H. Phys. Rev. , 1995, C51: 116713 LIUJim-Ye, ZHANGShao-Guang. Z. Phys., 1994, A348:31

[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]	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.
[3]	XING Yong-Zhong , LIU Jian-Ye , GUO Wen-Jun . Isospin Effects in the Isospin Fractionation Process in Intermediate Energy HeavyIon Collisions. Chinese Physics C, 2004, 28(4): 403-407.
[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]	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.
[6]	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.
[7]	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.
[8]	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.
[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]	ZENG XiangHua , CHEN LieWen , ZHANG FengShou , LUO YiXiao . Discussion on the Local Equilibrium in Intermediate HIC. Chinese Physics C, 2000, 24(3): 225-230.
[12]	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.
[13]	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.
[14]	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.
[15]	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.
[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]	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.
[18]	Chen Liewen , Zhang Xiaodong , Ge Lingxiao . Isospin Effects on Pre-equilibrium NucleonEmission in Heavy Ion Collisions. Chinese Physics C, 1996, 20(12): 1091-1096.
[19]	Zhu Quanling , Ge Lingxiao , Zhang Xiaodong . Isospin Effects on Dynamics of Heavy Ion Collisions. Chinese Physics C, 1994, 18(9): 853-857.
[20]	WU Guo-Hua , GE Ling-Xiao . EMISSION OF LIGHT PARTICLES IN HEAVY ION COLLISIONS. Chinese Physics C, 1988, 12(4): 541-547.

Access

Get Citation

ZHAO Qiang, GUO Wen-Jun, LIU Jian-Ye, ZUO Wei and WANG Shun-Jin. Isospin Dependence of Preequilibrium Nucleon Emission in Intermediate Energy Heavy Ion Collision[J]. Chinese Physics C, 2001, 25(3): 244-250.

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

Received: 2000-03-22
Revised: 1900-01-01

Article Metric

Article Views(4224)
PDF Downloads(608)
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 Dependence of Preequilibrium Nucleon Emission in Intermediate Energy Heavy Ion Collision

Corresponding author: ZHAO Qiang,

Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China2 Institute of Modern Physics, The Chinese Academy of Science, Lanzhou 730000, China3 Institute of Modern Physics, South West Jiaotong University, Chengdu 610031, China

Received Date: 2000-03-22

Accepted Date: 1900-01-01

Available Online: 2001-03-05

Abstract: The isospin dependence of preequilibrium nucleon emission for the neutron-deficient colliding system and neutron-rich system has been studied in the wide beam energy region. The calculation results show that the ratio of preequilibrium emission neutrons to protons is sensitive to the symmetrical potential and insensitive to the isospin dependence of in-medium nucleonnucleon collision cross section from low beam energy region to high energy region, in which nucleonnucleon collision dynamics is dominant, namely the isospin dependence of in medium nucleonnucleon cross section excites neutron and proton to be emitted with about the same probability in wide beam energy region. At the same time, the neutrons and protons are excited to be emitted with the same probability for Pauli potential, momentum dependence interaction and impact parameter, even though their effects on preequilibrium neutron number and proton number are obvious. The ratio of preequilibrium neutrons to protons for neutron rich colliding system is larger than the initial value of neutron proton ratio of colliding system, but that for neutron-deficient system is less than the initial value. In this case, one can compare the theoretical results with the experimental data systematically to extract information on the symmetrical potential.

HTML

Reference (1)

Isospin Dependence of Preequilibrium Nucleon Emission in Intermediate Energy Heavy Ion Collision

Abstract：

References

Access

Article Metrics

Metrics

通讯作者: 陈斌, bchen63@163.com

Email This Article