Symmetry energy for fragmentation in dynamical nuclear collisions
Symmetry energy for fragmentation in dynamical nuclear collisions
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DOI：
10.1103/physrevc.70.041604
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发表时间：
2004-09
影响因子：
3.1
通讯作者：
A. Ono;P. Danielewicz;W. Friedman;W. G. Lynch;M. Tsang
中科院分区：
文献类型：
--
作者：
A. Ono;P. Danielewicz;W. Friedman;W. G. Lynch;M. Tsang
我们从钙碰撞的反对称分子动力学计算中提取自由对称能作为碎片大小(质子数Z)的函数的值。简单的统计物理很好地描述了热核分裂时的分布，只要在高激发下自由能中的表面对称项比基态核中的表面对称项小得多。这一结果可能反映了这些体系解体时的低密度和有限温度条件。
We extract values for the free symmetry energy as a function of the fragment size (the proton number Z) from antisymmetrized molecular dynamics calculations of calcium collisions. Simple statistical physics describe well the distribution of hot nuclei at breakup, provided the surface symmetry term in the free energy is much smaller at high excitation than in ground state nuclei. This result may reflect the condition of low density and finite temperature when these systems disassemble.