Dynamical Behaviors of Liquid-Gas Phase Transition in Nuclei

ZHANG Ying-Xun; WU Xi-Zhen; LI Zhu-Xia

Chinese Physics C> 2002, Vol. 26> Issue(10) : 1065-1071

Dynamical Behaviors of Liquid-Gas Phase Transition in Nuclei

China institute of Atomic Energy, Beijing 102413, China2 Nuclear Theory center of National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China3 Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080, China

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Abstract：
Based on the quantum molecular dynamics model, the dynamical behaviors of the Liquid-gas phase transition in nuclei are investigated. In order to explore the characters of the Liquid-gas phase transition in the vicinity of the "critical point", the Maximum Lyapunov exponent (MLE) is employed and the method of calculation of the MLE is developed. The dependence of the mass distribution of fragments, density fluctuation and the MLE on temperature has been studied for nuclear systems ¹²⁴Sn and ²⁰⁸Pb. As the main results, we have found that for heavy nuclear systems the MLE and the density fluctuation reach the maximum values at the same temperature, in which the maximum liquid-gas coexistence region is also found from the mass distribution of fragments.

References

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ZHANG Ying-Xun, WU Xi-Zhen and LI Zhu-Xia. Dynamical Behaviors of Liquid-Gas Phase Transition in Nuclei[J]. Chinese Physics C, 2002, 26(10): 1065-1071.

ZHANG Ying-Xun, WU Xi-Zhen and LI Zhu-Xia. Dynamical Behaviors of Liquid-Gas Phase Transition in Nuclei[J]. Chinese Physics C, 2002, 26(10): 1065-1071. shu

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Received: 2001-11-07
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Dynamical Behaviors of Liquid-Gas Phase Transition in Nuclei

Corresponding author: ZHANG Ying-Xun,

China institute of Atomic Energy, Beijing 102413, China2 Nuclear Theory center of National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China3 Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080, China

Received Date: 2001-11-07
Accepted Date: 1900-01-01
Available Online: 2002-10-05

Abstract: Based on the quantum molecular dynamics model, the dynamical behaviors of the Liquid-gas phase transition in nuclei are investigated. In order to explore the characters of the Liquid-gas phase transition in the vicinity of the "critical point", the Maximum Lyapunov exponent (MLE) is employed and the method of calculation of the MLE is developed. The dependence of the mass distribution of fragments, density fluctuation and the MLE on temperature has been studied for nuclear systems ¹²⁴Sn and ²⁰⁸Pb. As the main results, we have found that for heavy nuclear systems the MLE and the density fluctuation reach the maximum values at the same temperature, in which the maximum liquid-gas coexistence region is also found from the mass distribution of fragments.