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

  • 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.
  • 加载中
  • [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
  • 加载中

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
Milestone
Received: 2001-10-26
Revised: 1900-01-01
Article Metric

Article Views(1964)
PDF Downloads(521)
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

  1. 本站搜索
  2. 百度学术搜索
  3. 万方数据库搜索
  4. CNKI搜索

Email This Article

Title:
Email:

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

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)

目录

/

DownLoad:  Full-Size Img  PowerPoint
Return
Return