Time scales in fragmentation
Time scales in fragmentation
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碎片化的时间尺度
DOI：
10.1103/physrevc.55.775
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
C. Dorso
中科院分区：
文献类型：
--
作者：
A. Strachan;C. Dorso
在经典的二维Lennard-Jones液滴分子动力学实验的框架下，研究了激发态有限系统的碎裂问题。这项工作的主要目的是获得关于这类过程的相关特征时间尺度(CTS)的相对值的信息。我们研究了碎片形成的CTS，径向通量的稳定，以及内部的温度。结果发现，当系统仍然稠密时，当径向通量达到其渐近值时，渐近碎片在相空间中很早就实现了。结果还表明，如果发生局部热平衡，系统在破裂过程中的温度相对于预期的分布是相当均匀的。重点研究了与渐近碎片携带的信息种类有关的质谱图统计性质的稳定化时间尺度。
The problem of fragmentation of excited finite systems is explored in the frame of classical molecular dynamics experiments of two-dimensional Lennard-Jones drops. The main objective of this work is to get information about the relative value of the relevant characteristic time scales (CTS) for this kind of process. We investigate the CTS for fragment formation, the stabilization of the radial flux, and the internal ``temperature.'' It is found that the asymptotic fragments are realized early in phase space, when the system is still dense, by the time the radial flux attains its asymptotic value. It is also shown that the temperature of the system during the breakup is quite homogenous with respect to the expected profile if local thermal equilibration takes place. Special emphasis is put on the investigation of the time scale of stabilization of the statistical properties of the mass spectrum, which is related to the kind of information carried by the asymptotic fragments.