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arXiv 1807.07481nucl-exnucl-th
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多重碎裂中最大碎片尺寸的分布:相变的痕迹

Distributions of the largest fragment size in multifragmentation: Traces of a phase transition

J. Brzychczyk, T. Pietrzak, A. Wieloch, W. Trautmann

摘要:

利用相对论能量下$^{197}$ Au射弹碎裂的ALADIN数据,研究了最大碎片电荷的分布。高阶波动的统计测量偏度和峰度提供了一个强大的指示的转变点,链接到一个相变的热力学极限。广泛的比较与预测的债券渗流模型证实了高精度的分布,以及整个破碎模式所代表的测量电荷的相关性,该模型在再现。与逾渗类似,在碎裂数据中确定了假临界点和临界点。不同的模型之间的区别和第一和第二阶相变的问题进行了讨论。

英文摘要:

Distributions of the largest fragment charge are studied using the ALADIN data on fragmentation of $^{197}$Au projectiles at relativistic energies. The statistical measures skewness and kurtosis of higher-order fluctuations provide a robust indication of the transition point, linked to a phase transition in the thermodynamic limit. Extensive comparisons with predictions of a bond percolation model corroborate the high accuracy of this model in reproducing the distributions as well as the whole fragmentation pattern as represented by the measured charge correlations. In analogy to percolation, the pseudocritical and critical points are identified in the fragmentation data. Questions concerning the distinction between different models and between first- and second-order phase transitions are discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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