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arXiv 1010.4342cond-mat.mes-hallnucl-th
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共振宽度分布与连续耦合动力学

Distribution of Resonance Widths and Dynamics of Continuum Coupling

G. L. Celardo, N. Auerbach, F. M. Izrailev, V. G. Zelevinsky

摘要:

我们分析了具有开放衰变通道的多体费米系统共振宽度的统计特性。根据连续耦合的强度,这样的系统揭示了标准卡方(波特-托马斯)宽度分布的偏差越来越大。这些偏差来自于通过共同的衰变通道增加本征态的相互作用的过程;在完美耦合的极限下,这个过程导致超辐射相变。宽度分布还取决于内在动力学(混沌与规则)。这些结果对于理解最近有关核内中子共振宽度分布的实验数据是很重要的。

英文摘要:

We analyze the statistics of resonance widths in a many-body Fermi system with open decay channels. Depending on the strength of continuum coupling, such a system reveals growing deviations from the standard chi-square (Porter-Thomas) width distribution. The deviations emerge from the process of increasing interaction of intrinsic states through common decay channels; in the limit of perfect coupling this process leads to the super-radiance phase transition. The width distribution depends also on the intrinsic dynamics (chaotic vs regular). The results presented here are important for understanding the recent experimental data concerning the width distribution for neutron resonances in nuclei.

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