Chin. Phys. Lett.  2000, Vol. 17 Issue (10): 711-713    DOI:
Original Articles |
Behavior of the Lyapunov Exponent and Phase Transition in Nuclei
WANG Nan1,2;WU Xi-Zhen1,4;LI Zhu-Xia1,3,4;WANG Ning1,2;ZHUO Yi- Zhong1,3,4;SUN Xiu-Quan2
1China Institute of Atomic Energy, Beijing 102413 2Department of Physics, Northwest University, Xian 710069 3Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080 4Nuclear Theory Center of National Laboratory of Heavy Ion Accelerator, Lanzhou 730000
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WANG Nan, WU Xi-Zhen, LI Zhu-Xia et al  2000 Chin. Phys. Lett. 17 711-713
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Abstract Based on the quantum molecular dynamics model, we investigate the dynamical behaviors of the excited nuclear system to simulate the latter stage of heavy ion reactions, which associate with a liquid-gas phase transition. We try to search a microscopic way to describe the phase transition in real nuclei. The Lyapunov exponent is employed and examined for our purpose. We find out that the Lyapunov exponent is one of good microscopic quantities to describe the phase transition in hot nuclei. Coulomb potential and the finite size effect may give a strong influence on the critical temperature. However, the collision term plays a minor role in the process of the liquid-gas phase transition in finite systems.

Keywords: 05.45.+b      05.70.Fh      24.60.Lz     
Published: 01 October 2000
PACS:  05.45.+b  
  05.70.Fh (Phase transitions: general studies)  
  24.60.Lz (Chaos in nuclear systems)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2000/V17/I10/0711
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WANG Nan
WU Xi-Zhen
LI Zhu-Xia
WANG Ning
ZHUO Yi- Zhong
SUN Xiu-Quan
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