Probing Equilibration in HICs and Symmetry Energy by Using Isospin-Related Observables

LI Qing-Feng; LI Zhu-Xia

Chinese Physics C> 2002, Vol. 26> Issue(9) : 926-932

Probing Equilibration in HICs and Symmetry Energy by Using Isospin-Related Observables

LI Qing-Feng ^, ,
LI Zhu-Xia

China Institute of Atomic Energy, Beijing 102413, China2 Center of Theoretical Nuclear Physics, National Laboratory of Lanzhou Heavy Ion Accelerator, Lanzhou 730000, China3 Institute of Theoretical Physics, CAS, Beijing 100080, China

Abstract
HTML
Reference
Related

PDF

Abstract：
We have studied the equilibration with respect to isospin degree of freedom in four systems ⁹⁶Ru+⁹⁶Ru,⁹⁶ Ru+⁹⁶Zr,⁹⁶Zr+⁹⁶Ru,⁹⁶Zr+⁹⁶Zr at 100 MeV/u and 400MeV/u with isospin dependent QMD. It is proposed in this paper that the neutron-proton differential rapidity distribution is a sensitive probe to the degree of equilibration with respect to the isospin degree of freedom. By analyzing the average N/Z ratio of emitted nucleons, light charged particles (LCP) and intermediate mass fragments (IMF), it is found that there exists memory effect in multifragmentation process. The average N/Z ratio of IMF reduces largely as beam energy increases from 100MeV/u to 400MeV/u, which may result from the change of the behavior of the isotope distribution of IMF. The isotope distribution of IMF does also show certain memory effect at 100 MeV/u case but not at 400 MeV/u case. We also found the rapidity distribution of differential neutron-proton counting in neutron rich nucleus-nucleus collisions at intermediate energies is sensitive to the isospin dependent part of nuclear potential. In conclusion, based on these studies we have found it's an effective way to explore whether the final equilibration could be reached in intermediate HICs by constructing a set of isospin (a)symmetry nuclear-nuclear collision systems with same mass and different charge.

References

[1]

Nebauer R, Aichilin J. Nucl . Phys . . 2001, A681 : 3532 Bondorf J P, Botvina A S el al. Phys. Rep., 1995. 257: 1333 Gossiaux P B, Puri R, Hartnack C et al. Nucl . Phys., 1997, A619: 3794 Rami F et al . Phys. Rev. Lelt . . 2000, 84: 11205 Peamon J M, Aboussir Y, Pull h K. Nucl. Phys., 1991, A528: 16 Matsui T. Nucl . Phys., 1981, A370:3657 Fumstahl R J, Tang H B, Serot B D. Phys. Rev., 1995, C52: 13688 Lee C H. Kuo T T S, LI G Q rt al. Phys. Rev., 1998, C57:34889 Aichelin J . Phys. Rep., 1991, 202:23310 Hartnack C et al . Nucl. Phys., 1989, A495: 30311 CHEN K. Phys. Rev., 1968, 166:94912 Kruse H, Jacak B V, Molitoris J J et al. Phys. Rev., 1985, C31: 177013 YenneIlo S J et al. Nurl. Phys., 2001, A681:317c

[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]	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]	ZUO Wei , LI Zeng-Hua , LIU Jian-Ye . Properties of Isospin Asymmetric Nuclear Matterand Extended BHF Approach(Ⅰ) Isospin Dependent Extended BHF Approach. Chinese Physics C, 2002, 26(7): 703-711.
[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 , 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.
[13]	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.
[14]	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.
[15]	Chen Liewen , Zhang Fengshou , Jin Genming . Isospin Effects on Balance Energy in HIC at Intermediate Energies. Chinese Physics C, 1999, 23(5): 469-474.
[16]	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.
[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 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]	GE Ling-Xiao , LIU Jian-Ye , WANG Shun-Jin . RELAXATION OF SINGLE PARTICLE DEGREES OF FREEDOM IN HEAVY ION COLLISION. Chinese Physics C, 1989, 13(3): 245-251.

Access

Get Citation

LI Qing-Feng and LI Zhu-Xia. Probing Equilibration in HICs and Symmetry Energy by Using Isospin-Related Observables[J]. Chinese Physics C, 2002, 26(9): 926-932.

LI Qing-Feng and LI Zhu-Xia. Probing Equilibration in HICs and Symmetry Energy by Using Isospin-Related Observables[J]. Chinese Physics C, 2002, 26(9): 926-932. shu

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

Received: 2001-10-26
Revised: 1900-01-01

Article Metric

Article Views(3291)
PDF Downloads(525)
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

Probing Equilibration in HICs and Symmetry Energy by Using Isospin-Related Observables

Corresponding author: LI Qing-Feng,

China Institute of Atomic Energy, Beijing 102413, China2 Center of Theoretical Nuclear Physics, National Laboratory of Lanzhou Heavy Ion Accelerator, Lanzhou 730000, China3 Institute of Theoretical Physics, CAS, Beijing 100080, China

Received Date: 2001-10-26

Accepted Date: 1900-01-01

Available Online: 2002-09-05

Abstract: We have studied the equilibration with respect to isospin degree of freedom in four systems ⁹⁶Ru+⁹⁶Ru,⁹⁶ Ru+⁹⁶Zr,⁹⁶Zr+⁹⁶Ru,⁹⁶Zr+⁹⁶Zr at 100 MeV/u and 400MeV/u with isospin dependent QMD. It is proposed in this paper that the neutron-proton differential rapidity distribution is a sensitive probe to the degree of equilibration with respect to the isospin degree of freedom. By analyzing the average N/Z ratio of emitted nucleons, light charged particles (LCP) and intermediate mass fragments (IMF), it is found that there exists memory effect in multifragmentation process. The average N/Z ratio of IMF reduces largely as beam energy increases from 100MeV/u to 400MeV/u, which may result from the change of the behavior of the isotope distribution of IMF. The isotope distribution of IMF does also show certain memory effect at 100 MeV/u case but not at 400 MeV/u case. We also found the rapidity distribution of differential neutron-proton counting in neutron rich nucleus-nucleus collisions at intermediate energies is sensitive to the isospin dependent part of nuclear potential. In conclusion, based on these studies we have found it's an effective way to explore whether the final equilibration could be reached in intermediate HICs by constructing a set of isospin (a)symmetry nuclear-nuclear collision systems with same mass and different charge.

HTML

Reference (1)

Probing Equilibration in HICs and Symmetry Energy by Using Isospin-Related Observables

Abstract：

References

Access

Article Metrics

Metrics

通讯作者: 陈斌, bchen63@163.com

Email This Article